Sony DDS-4, SDT-10000, SDT-11000 Product Description Manual

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PRODUCT DESCRIPTION MANUAL

DDS-4 Tape Drive

Model : SDT-10000

: SDT-11000

Ver. 1.2 July, 1999

Sony Corporation

Page 2

Difference List ( From Ver.1.1 To Ver.1.2 )

SDT-11000 SCSI Signals ( Low-Voltage-Differential

1-11Introduction

1-2

1.1

Feature of the drive

2-3

2.1.3

Connectors

2-3

2.13.1

SCSI Cables and Terminators

2-6

2.3.2.2

Burst Data Transfer Rate To and From the SCSI Bus

3-3/3-4

3.1.4

SCSI 68 Pin Connector

3-3

Table 3-1

SDT-11000 SCSI Signals ( Low-Voltage-Differential

Type Bus P Cable Signal Assignment)

7-8

Error Set 2

13h: DDS Controller SRAM TEST FAILURE

Model Name

Page Clause Title Modify Add Delete

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1. Introduction

234

2. Specification

3. Installation

4. Operation

5. SCSI Interface

6. Command Specificaiton

7. Drive Diagnostics

234

APPENDIX

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1. INTRODUCTION

12345

1 INTRODUCTION ............................................................................................................. 1-1

1. 1 Features of the drive ........................................................................................ 1-2

1. 2 Reference ......................................................................................................... 1-3

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1. Introduction

1. INTRODUCTION

This manual provides information about the Sony SDT-10000/SDT-11000 Digital Data Storage (DDS) Tape Drives which is necessary to integrate the drives into OEM products. This manual describes the specifications, SCSI Interface, diagnostics, operation and installation of Sony DDS Tape Drives. This drive is:

• SDT-10000/SDT-11000 20 to 40 GB capacity, 2.36 to 4.72 MBytes/Second Transfer Rate, Ultra/WIDE, Singleended or Low Voltage differential, 3.5"FH

*1, *2 This is assuming 2:1 Compression ratio.

The degree of data compression attained while recording data varies according to system environment and data type.

Note: The SDT-10000/SDT-11000 drive uses data compression to achieve high capacity and high transfer rates. Ac-

tual capacity and transfer rate depends on the source file type.

Note: The capacity ratings listed above are based on a 150 meter DDS-4 tape cassette. The Sony SDT-10000/SDT-11000 drive is a high capacity data storage device using 4 mm DAT (Digital Audio Tape) technology. The SDT-10000/SDT-11000 drive achieves high data reliability through read-after-write, an additional level of Error Correction Code, and other features. The Sony SDT-10000/SDT-11000 drive stores data on tape using a standard format called DDS (Digital Data Storage), DDS-DC, DDS-2, DDS-3 and DDS-4. This format is used by numerous other DDS tape drive manufacturers, providing a broad range of compatible tape drives. The Sony SDT-10000/SDT-11000 is fully READ and WRITE compatible with the DDS-4, DDS-3, DDS-2, DDS and DDS-DC format tapes.

SONY SDT-10000/SDT-11000 DDS Tape Drive

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1. Introduction

1.1 FEATURES OF THE DRIVE

Major features of the Sony SDT-10000/SDT-11000 include:

• 20 GB capacity

• Sustained transfer rate - 2,360 KB/sec

• Supported Format: DDS-4, DDS-3, DDS-2, DDS , DDS-DC and DCLZ

• Fully READ and WRITE compatible with the DDS-4, DDS-3, DDS-2, DDS and DDS-DC format tapes

• Burst transfer rate

• Large 10 MB Buffer

• 3 1/2 inch form factor

• Embedded SCSI interface (Ultra/WIDE, Single-ended or Low Voltage differential)

• Supports Variable or Fixed record length

• Supports SCSI Disconnection/Arbitration

• Read After Write (RAW)

• Frame rewrite function

• Three levels of Error Correction Code (ECC)

• High Speed search (100 times normal Read/Write speed)

• Random read

• N-Group write option (DDS-2, DDS and DDS-DC only)

• Dual Partition option

(20GB to 40 GB with Data Compression) *1

(approximately 2.36 MB/s to 4.72 MB/s with Data Compression) *2 *1, *2 This is assuming 2:1 Compression ratio.

The degree of data compression attained while recording data varies according to system environment and data type.

- 14 MB/sec Asynchronous

- 40 MB/sec Synchronous

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SONY SDT-10000/SDT-11000 DDS Tape Drive

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1. Introduction

1.2 REFERENCE

Please refer to the following documents for additional information:

• Helical-Scan Digital Computer Tape Cartridge for Information Interchange (3.81 mm (0.150 in) Digital Data Stor-

age (DDS) Recorded Format) ANSI X3.203

• Proposed Final Test Unrecorded Helical-Scan Digital Computer Tape Cartridge

ANSI ASC TC X3B5 Document 92-251

• 3,81 mm Wide Magnetic Tape Cartridge For Information Interchange

Helical Scan Recording, DDS Format, June 1990 European Computer Manufacturers Association (ECMA-139)

• 3,81 mm Wide Magnetic Tape Cartridge For Information Interchange

Helical Scan Recording, DDS-DC Format, June 1991 European Computer Manufacturers Association (ECMA-150)

• Data Compression For Information Interchange

Adaptive Coding with Embedded Dictionary, DCLZ Algorithm, June 1991 European Computer Manufacturers Association (ECMA-151)

• 3.81mm Wide Magnetic Tape Cartridge For Information Interchange

Helical Scan Recording, DDS-2 Format Using 120m Length Tapes, December 1993 European Computer Manufacturers Association (ECMA-198)

• 3.81mm Wide Magnetic Tape Cartridge For Information Interchange

Helical Scan Recording, DDS-3 Format Using 125m Length Tapes European Computer Manufacturers Association(ECMA XXX)

• Designing a Data Storage Format for Digital Audio Tape (DAT)

DDS Manufacturers Group

• Small Computer System Interface (SCSI-1), ANSI X3.131-1986

The ANSI authorized standard for SCSI implementation, available through ANSI

• Enhanced Small Computer Systems Interface (SCSI-2)

ANSI X3T9.2/86-109 (Revision 10H, or above), available through ANSI

• Parallel Small Computer Systems Interface (SCSI-3)

ANSI X3T10/855D (Revision 15a, or above) available through ANSI.

Note 1: Also available from: European Computer Manufacturers Association

114 Rue du Rhone - CH-1204 Geneva(Switzerland) TEL: (41) 22-735-36-34 FAX: (41) 22-786-52-31

Note 2: Also available from: Global Engineering Documents

2805 McGaw Avenue Irvine, CA 92714 (800) 854-7179 (714) 261-1455

SONY SDT-10000/SDT-11000 DDS Tape Drive

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2. SPECIFICATION

2. 1 PHYSICAL SPECIFICATIONS ................................................................................. 2-1

2. 1. 1 Dimensions .................................................................................................. 2-1

2. 1. 2 Weight........................................................................................................... 2-3

2. 1. 3 Connectors................................................................................................... 2-3

2. 2 ENVIRONMENTAL SPECIFICATIONS .................................................................... 2-4

2. 2. 1 Temperature and Humidity Range ............................................................. 2-4

2. 2. 2 Altitude ......................................................................................................... 2-4

2. 2. 3 Dust............................................................................................................... 2-4

2. 2. 4 Vibration ....................................................................................................... 2-4

2. 2. 5 Shock............................................................................................................ 2-4

2. 2. 6 Acoustic Noise............................................................................................. 2-5

2. 2. 7 ESD ............................................................................................................... 2-5

2. 2. 8 Orientation ................................................................................................... 2-5

2. 3 PERFORMANCE SPECIFICATION.......................................................................... 2-6

2. 3. 1 Data Capacity............................................................................................... 2-6

2. 3. 2 Data Transfer Rate....................................................................................... 2-6

2. 3. 3 Initialize Time ............................................................................................... 2-6

2. 3. 4 Load Time..................................................................................................... 2-7

2. 3. 5 Rewind Time ................................................................................................ 2-7

2. 3. 6 Search Time ................................................................................................. 2-7

2. 3. 7 Unload Time ................................................................................................. 2-7

2. 3. 8 Error Rate ..................................................................................................... 2-7

2. 3. 9 Retry Limits on Rewrites ............................................................................ 2-7

2. 3. 10 Definition of Failure................................................................................... 2-7

2. 3. 11 Mean Time Between Failures ................................................................... 2-7

2. 3. 12 Mean Time To Repair ................................................................................ 2-7

2. 3. 13 Component Life ......................................................................................... 2-8

2. 3. 14 Durability .................................................................................................... 2-8

2. 4 SAFETY...................................................................................................................... 2-8

2. 4. 1 Conditions of Acceptability ........................................................................ 2-8

2. 5 INSTALLATION REQUIREMENTS .......................................................................... 2-9

2. 5. 1 Power Requirements................................................................................... 2-9

2. 1. 1. 1 Mounting Holes .......................................................................... 2-2

2. 1. 3. 1 SCSI Cables and Terminators................................................... 2-3

2. 3. 2. 1 Sustained Data Transfer Rate To and From Tape ................... 2-6

2. 3. 2. 2 Burst Data Transfer Rate To and From the SCSI Bus ............ 2-6

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2. SPECIFICATION

2. SPECIFICATIONS

Physical, environmental and performance specifications for the SDT-10000/SDT-11000

2. 1 PHYSICAL SPECIFICATIONS

2. 1. 1 Dimensions

The SDT-10000/SDT-11000 conforms to the 3.5 inch standard height form factor.

SDT-10000/SDT-11000

Height 41.2 mm (1.62 in) ± 0.5 mm (0.02 in) Width 101.6 mm (4.0 in) ± 0.5 mm (0.02 in) Depth 146.0 mm (5.75 in) ± 0.5 mm (0.02 in)

Note: The above dimensions do not include the front panel thickness, eject button and some projecting.

41.2±0.5 mm (1.62 inch)

101.6±0.5 mm (4.00 inch)

101.6±0.5 mm

146±0.5 mm

3.8±0.5 mm (0.15 inch)

SDT-10000/SDT-11000

Figure 2-1 Dimensions

(4.00 inch)

(5.75 inch)

41.2±0.5 mm (1.62 inch)

SONY SDT-10000/SDT-11000 DDS Tape Drive

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2. SPECIFICATION

2. 1. 1. 1 Mounting Holes

Figure 2-2 gives details of the mounting holes for the drive.

94 ± 0.3 mm

3.8 ± 0.5 mm (0.15 in)

21 ± 0.3 mm

(0.83 in)

5 ± 0.3 mm

(3.70 in)

(0.20 in)

31 ± 0.3 mm

(1.22 in)

42 ± 0.3 mm

(1.65 in)

70 ± 0.3 mm

(2.76 in)

146 ± 0.5 mm

(5.75 in)

90 ± 0.3 mm

(3.45 in)

60 ± 0.3 mm

(2.36 in)

SDT-10000/SDT-11000

Figure 2-2 Mounting Holes

6-M3 (DEPTH 3mm)

(DEPTH 0.12 in)

3-M3 (DEPTH 3mm)

(DEPTH 0.12 in)

(4.00 in)

101.6 ± 0.5 mm

(1.62 in)

41.2 ± 0.5 mm

2 - 2

Note: Mounting Screw Thread Length 2.5 mm. If the mounting screw thread length is exceeded, damage to the drive

may occur.

SONY SDT-10000/SDT-11000 DDS Tape Drive

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2. SPECIFICATION

2. 1. 2 Weight

• SDT-10000/SDT-11000 - 600 grams (1 lb 5 oz), without a cassette

2. 1. 3 Connectors

The SDT-10000/SDT-11000 has a SCSI connector with a power connector at the positions shown in Figure 2-3. All other connectors are for use by Sony’s manufacturing and service facilities only.

SCSI & Power Connector

SDT-10000/SDT-11000

Figure 2-3 Connector Positions

2. 1. 3. 1 SCSI Cables and Terminators

The Single-Ended SCSI configuration is supported by SDT-10000 and SDT-11000. The Low-Voltage-Differential SCSI configuration is supported by SDT-11000. The hardware specification of this interface can be found in Clause 3. Physical Characteristics, of the X3T10/1142D (SCSI Parallel Interface2) standard. Only unshielded connectors are supported. Possible cable and connector sources are listed below. This does not imply that these are the only sources for SCSI accessories.

Note: When using high speed data transfer with the SDT-10000/SDT-11000, it is recommended that total length of the

SCSI data cable not exceeded 1.5m for Single Ended SCSI configuration. As for Low-Voltage-differential SCSI configuration for SDT-11000, less than 12m is recommended.

Cable 30 AWG Ribbon

Hitachi UL 20818 (or equivalent)

Connector AMP 1-786090-7 (or equivalent)

SONY SDT-10000/SDT-11000 DDS Tape Drive

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2. SPECIFICATION

2. 2 ENVIRONMENTAL SPECIFICATIONS

Note: The specifications which apply when a medium is present may be different than these.

2. 2. 1 Temperature and Humidity Range

Temperature Operating: 5°C to 40°C ( T<10°C/h) Non-operating(mech): -40°C to 70°C ( T<20°C/h) Non-operating(tape): -40°C to 45°C ( T<20°C/h)

Humidity Operating: 20 to 80% RH, non-condensing

Non-operating(mech): 5 to 95% RH ( RH<30%/h) Non-operating(tape): 20 to 80% RH ( RH<30%/h)

Maximum wet bulb temperature=26°C

2. 2. 2 Altitude

Operating: 0 to 2133 m (0 to 7000 feet)

2. 2. 3 Dust

Operating: Less than 150 microgram/m

Based Sampling period 24 hours

2. 2. 4 Vibration

Operating: Swept Sine 5 to 500 Hz

@ 0.25 G Peak 1 Octave/min. 3 axis, 3 directions

Non-operating: Swept Sine 5 to 500 Hz

@ 0.5 G Peak 1 Octave/min. 3 axis, 3 directions

2. 2. 5 Shock

Operating: No Data Loss

Half Sine 5 G Peak 3 ms 3 axes, 3 directions Interval 10 seconds

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Non-operating: No Device Damage

Half Sine 90 G Peak 3 ms (30 G Peak 11 ms) 3 axes, 3 directions

SONY SDT-10000/SDT-11000 DDS Tape Drive

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2. SPECIFICATION

2. 2. 6 Acoustic Noise

The ambient noise level is no greater than 25db (A). The sound-meter on (A) scale is located 1m in front of the center of the unit front panel.

Streaming Write/Read 35 db (A) Insert/Eject 60 db (A)

(A): A curve weight

2. 2. 7 ESD

Discharge Voltage Less than 15kV: No operation failure Less than 20kV: No drive damage

2. 2. 8 Orientation

The SDT-10000/SDT-11000 can be installed in three different mounting positions as shown in the figure below. Each position has a maximum tolerance of +/– 10 degrees.

10°10

Figure 2-4 Mounting Attitude and Tolerance

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2. SPECIFICATION

2. 3 PERFORMANCE SPECIFICATION

The data capacity, data transfer rate and data reliability specifications in this chapter require the media to conform to the DDS-4 Media Specification and also require the drive and media to remain within their respective operating and nonoperating environmental specifications. The specifications below also assume that the C3 ECC frame is generated on writing and used as necessary on reading, and further assumes that read-after-write rewrites are used as necessary on writing.

2. 3. 1 Data Capacity

The native (uncompressed) capacities of different length cartridges are as follows. Note that 60 m and 90 m cartridges are automatically written in DDS-1 format, only 120 m cartridges are written in DDS-2 format, and only 125 m cartridges are written in DDS-3 format, and only 150 m cartridges are written in DDS-4 format

Length Format Native Capacity 60 m DDS-1 1.3 GB typical 90 m DDS-1 2.0 GB typical 120 m DDS-2 4.0 GB typical 125 m DDS-3 12.0 GB typical 150 m DDS-4 20.0 GB typical

The SDT-10000/SDT-11000 includes a data compression capability. When data compression is enabled that the drive capacity can increase typically twice. The efficiency of the data compression depends on the actual data that is being compressed and cannot be predicted precisely prior to compression.

Sustained transfer rate Format W/O Compression W/Compression *1 DDS-1 778 KB/S 1556 KB/S DDS-2 778 KB/S 1556 KB/S DDS-3 2360 KB/S 4720 KB/S DDS-4 2360 KB/S 4720 KB/S

2. 3. 2 Data Transfer Rate

2. 3. 2. 1 Sustained Data Transfer Rate To and From Tape

The sustained transfer rates to and from the tape are as follows. For this sustained rate to be achieved, the drive must be streaming. There may be some dependency on the host for this to be achieved. *1 This is assuming 2:1 Compression ratio.

The degree of data compression attained while recording data varies according to system environment and data type.

2. 3. 2. 2 Burst Data Transfer Rate To and From the SCSI Bus

The SDT-10000/SDT-11000 will transmit and receive data bursts to and from the SCSI bus at a maximum burst rate of 14 megabytes per second, using WIDE SCSI asynchronous transfers and 40 megabytes per second, using WIDE SCSI synchronous transfers.

2 - 6

2. 3. 3 Initialize Time

Initialize Time means the period from the time the drive is powered on to the time when the drive is ready and waiting for a SCSI command such as INQUIRY or TEST UNIT READY. Initialize Time is less than 1 seconds.

Note: The drive will respond with BUSY status until the completion of the Initialize Time. Note: The Initialize Time does not include the time necessary for drive diagnostics to complete and the drive to become

ready for tape insertion.

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2. SPECIFICATION

2. 3. 4 Load Time

Load Time means the period from the time when the operator inserts a cassette into the drive to the time when the drive is ready. Load Time is less than 24 seconds (for a single partition tape).

2. 3. 5 Rewind Time

Rewind Time means the period from the beginning to the end of rewinding sequence. This value depends on the tape length and the position of the head along the tape. Rewind Time is less than 80 seconds, when a 150 meter tape is loaded.

2. 3. 6 Search Time

Search Time means the period for the drive to find the position that is required by a command. This time also depends on the tape length and the position of the head along the tape. Search Time is less than 90 seconds, when a 150 meter tape is loaded.

2. 3. 7 Unload Time

Unload Time means the period from the beginning of the unload sequence caused by Unload Command or Eject button to the time when a cassette is ejected from the slot. Unload Time does not include Rewind time. Unload Time is less than 20 seconds (for a single partition tape).

2. 3. 8 Error Rate

The uncorrectable bit error rate is expected to be less than 10

-15

. For further details, refer to “Designing a Data Storage

Format for Digital Audio Tape (DAT)”, produced by the DDS Manufacturers Group.

2. 3. 9 Retry Limits on Rewrites

For Read-After-Write error correction, each frame can be rewritten up to a maximum of 255 times giving 256 writes of the frame. With N-Group writing, where every group is written a fixed number of times, the upper limit is 8. N-Group writing is not supported by DDS-3 and DDS-4.

2. 3. 10 Definition of Failure

A failure is defined as any permanent malfunction of the drive that prevents the user from retrieving data from tape. This includes failure to power up, failure to unload or eject a cassette, or failure to write and read data to and from the tape, providing that both the drive and tape are being used within specification. Faults are not considered failures when they are related to operator error, mishandling and abuse, system-related faults (cabling problems, unsupported systems, operating software, and so on), no trouble found, and transportation damage.

2. 3. 11 Mean Time Between Failures

The Mean Time Between Failures (MTBF) for the SDT-10000/SDT-11000 is 250,000 power-on hours, assuming a duty cycle of 40%, where:

Duty cycle = × 100

Tape Motion Time Power-on Time

12.5% is assumed as a typical usage level.

2. 3. 12 Mean Time To Repair

The Mean Time To Repair (MTTR) of the SDT-10000/SDT-11000 is 30 minutes. Since at the field level the entire drive is considered a Field Replaceable Unit (FRU) the time to replace the drive with a new one is less that 30 minutes.

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2. SPECIFICATION

2. 3. 13 Component Life

The specified life of the SDT-10000/SDT-11000 is 8 years average. The usage model for this specification is as follows.

3 hours tape pulling time per day 6 days usage per week

The SDT-10000/SDT-11000 is equivalent to 7,500 hours tape-pulling life.

2. 3. 14 Durability

The durability of the components in the SDT-10000/SDT-11000 will exceed the number of operations listed on the

following table:

Start/Stop 400,000 times Reposition 3,000,000 times Thread/Unthread 10,000 times Load/Eject 10,000 times

2. 4 SAFETY

The SDT-10000/SDT-11000 conforms to the following safety standards:

• Underwriters Laboratories, Inc. UL 1950 (Third Edition), Safety of Information Technology Equipment, Including Electrical Business Equipment.

• Canadian Standards Association CSA-C22.2 No. 950 (CUL), Safety of Information Technology Equipment, Including Electrical Business Equipment.

• TUV EN 60950: 1992 + A1 + A2 + A3 + A4 + A11 Safety of Information Technology Equipment, Including Electrical Business Equipment.

• CE Mark

2. 4. 1 Conditions of Acceptability

The SDT-10000/SDT-11000 is for use only in equipment where the suitability of the combination has been determined by an appropriate certification organization (for example, Underwriters Laboratories, Inc. or the Canadian Standards Association in North America, and the British Standards Institution or Verband Deutscher Elektrotechniker in Europe). Other considerations include the following:

1. An enclosure must be supplied to limit the operator’s access to live parts, to provide system stability, and to

furnish the drive with the necessary grounding integrity.

2. The necessary voltage supplies must be provided. These supplies are Extra Low Voltage SEC for UL and CSA,

or Safety Extra Low Voltage for BSI, VDE, and so on, of +5V and +12V DC.

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SONY SDT-10000/SDT-11000 DDS Tape Drive

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2. SPECIFICATION

2. 5 INSTALLATION REQUIREMENTS

2. 5. 1 Power Requirements SDT-10000/SDT-11000

Voltage

5V +/-5%

12V +/-10%

Max Ripple

100 mV p-p

Current

Maximum

(Load/Unload)

2.0 A

1.6 A

Typical

(Write/Read)

1.0 A

0.3 A

SONY SDT-10000/SDT-11000 DDS Tape Drive

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3. INSTALLATION

3. 1 SCSI Connection/Setting the SCSI ID ..................................................................... 3-1

3. 1. 1 SCSI ID Number Jumper ............................................................................. 3-2

3. 1. 2 Parity Enable Jumper.................................................................................. 3-2

3. 1. 3 Power Connector......................................................................................... 3-2

3. 1. 4 SCSI 68 pin Connector................................................................................ 3-3

3. 2 Option Switches (DIP Switch).................................................................................. 3-4

3. 2. 1 Termination Power Switch.......................................................................... 3-4

3. 2. 2 Data Compression ON switch .................................................................... 3-5

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3. Installation

3 INSTALLATION

3. 1 SCSI CONNECTION/SETTING THE SCSI ID

Pin 34

Pin 68

SCSI 68 pin connector (Non-Shielded)

SCSI ID

321

SCSI ID

P.E.

power connector

4321

GND GND 12V5V

Parity Enable

Jumpers

Reserved

SCSI ID 3

Parity

Disable

Note :

SCSI ID 2

SCSI ID 1

Enable

SCSI ID 0

= CLOSE/Jumper = OPEN/Jumper not installed

Don’t care

SONY SDT-10000/SDT-11000 DDS Tape Drive

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3. Installation

3. 1. 1 SCSI ID Number Jumper

The SCSI ID number of the SDT-10000/SDT-11000 is selected by the SCSI ID number jumpers. The figure below shows the jumper configuration for each of the possible SCSI IDs.

SCSI ID ID3 ID2 ID1 ID0

0 :::: 1 :::| 2 ::|: 3 ::|| 4 :|:: 5 :|:| 6 :||: 7 :||| 8 |:::

9 |::| 10 |:|: 11 |:|| 12 ||:: 13 ||:| 14 |||: 15 ||||

: = OPEN Jumper not installed | = CLOSED Jumper installed

3. 1. 2 Party Enable Jumper

Parity check function can be disabled by jumper. Parity check is disabled while left end jumper is installed. Parity generate function is always enabled.

Parity Setting

Enable |

Disable :

: = OPEN Jumper not installed | = CLOSED Jumper installed

3. 1. 3 Power Connector

The power connector is illustrated as Figure 3-1

4321

3 - 2

GND GND 12V5V

Figure 3-1: Power Connector

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3. Installation

3. 1. 4 SCSI 68 pin Connector

Figure 3-2 illustrates SCSI 68 pin connector, and table 3-1 shows the assignments for the pins of the connector.

Pin 34

Pin 68

Figure 3-2: Non-shielded SCSI Device Connector

SDT-11000 supports Low-Voltage-Differential SCSI configuration as shown table 3-1. SDT-10000 and SDT-11000 support Single-Ended SCSI configuration as shown table 3-2. SDT-11000 detects and switches SCSI configuration between Low-Voltage-Differential and Signal-ended modes by monitoring DIFSENS signal assigned pin 16 SCSI bus. (refer to table 3-1)

Table 3-1: SDT-11000 SCSI Signals (Low-Voltage-Differential Type BUS P Cable Signal Assignment)

Signal Name Cable Conductor Number Signal Name

-DB(12) 35 1 +DB(12)

-DB(13) 36 2 +DB(13)

-DB(14) 37 3 +DB(14)

-DB(15) 38 4 +DB(15)

-DB(P1) 39 5 +DB(P1)

-DB(0) 40 6 +DB(0)

-DB(1) 41 7 +DB(1)

-DB(2) 42 8 +DB(2)

-DB(3) 43 9 +DB(3)

-DB(4) 44 10 +DB(4)

-DB(5) 45 11 +DB(5)

-DB(6) 46 12 +DB(6)

-DB(7) 47 13 +DB(7)

-DB(P) 48 14 +DB(P) GROUND 49 15 GROUND GROUND 50 16 DIFFSENS

TERMPWR 51 17 TERMPWR TERMPWR 52 18 TERMPWR RESERVED 53 19 RESERVED

GROUND 54 20 GROUND

-ATN 55 21 +ATN

GROUND 56 22 GROUND

-BSY 57 23 +BSY

-ACK 58 24 +ACK

-RST 59 25 +RST

-MSG 60 26 +MSG

-SEL 61 27 +SEL

-C/D 62 28 +C/D

-REQ 63 29 +REQ

-I/O 64 30 +I/O

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3. Installation

Table 3-2: SDT-10000/SDT-11000 SCSI Signals (Signal Ended Type BUS P Cable Signal Assignment)

Signal Name Cable Conductor Number Signal Name

-DB(8) 65 31 +DB(8)

-DB(9) 66 32 +DB(9)

-DB(10) 67 33 +DB(10)

-DB(11) 68 34 +DB(11)

Signal Name Cable Conductor Number Signal Name

-DB(12) 35 1 GROUND

-DB(13) 36 2 GROUND

-DB(14) 37 3 GROUND

-DB(15) 38 4 GROUND

-DB(P1) 39 5 GROUND

-DB(0) 40 6 GROUND

-DB(1) 41 7 GROUND

-DB(2) 42 8 GROUND

-DB(3) 43 9 GROUND

-DB(4) 44 10 GROUND

-DB(5) 45 11 GROUND

-DB(6) 46 12 GROUND

-DB(7) 47 13 GROUND

-DB(P) 48 14 GROUND GROUND 49 15 GROUND GROUND 50 16 GROUND

TERMPWR 51 17 TERMPWR TERMPWR 52 18 TERMPWR

RESERVED 53 19 RESERVED

GROUND 54 20 GROUND

-ATN 55 21 GROUND

GROUND 56 22 GROUND

-BSY 57 23 GROUND

-ACK 58 24 GROUND

-RST 59 25 GROUND

-MSG 60 26 GROUND

-SEL 61 27 GROUND

-C/D 62 28 GROUND

-REQ 63 29 GROUND

-I/O 64 30 GROUND

-DB(8) 65 31 GROUND

-DB(9) 66 32 GROUND

-DB(10) 67 33 GROUND

-DB(11) 68 34 GROUND

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SONY SDT-10000/SDT-11000 DDS Tape Drive

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3. Installation

3. 2 OPTION SWITCHES (DIP SWITCH)

UNLOAD

1234567

3. 2. 1 Termination Power Switch

1234567

1 Reserved (OFF) 2 Reserved (OFF) 3 Reserved (OFF)

4 Reserved (OFF) 5 Terminator Power (ON) 6 Reserved (OFF) 7 DC Control-1 (ON) 8 DC Control-2 (OFF)

( ) …default setting

Position 5 of DIP switch is used to set whether SDT-10000/SDT-11000 provides the termination power to pin 17, 18, 51, 52 on SCSI bus, or not.

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3. Installation

3. 2. 2 Data Compression ON switch

Data compression can be selected by DIP switch.

DC Control-1 DC Control-2

OFF OFF

OFF ON

ON OFF

ON ON

Table 3-2: Data Compression Switches

Definition Compression disabled at power-on. The host is allowed to control compression. Compression disabled at power-on. The host is not allowed to control compression. Compression enabled at power-on. The host is allowed to control compression. Compression enabled at power-on. The host is not allowed to control compression.

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4. OPERATION

4. 1 SUMMARY OF LED INDICATIONS........................................................................... 4-1

4. 2 OPERATOR ACTION................................................................................................. 4-3

4. 3 INTERNAL FUNCTION ............................................................................................. 4-4

4. 4 TAPE FORMAT......................................................................................................... 4-7

4. 5 MAINTENANCE, TROUBLESHOOTING AND SERVICE ....................................... 4-8

4. 6 DATA COMPRESSION........................................................................................... 4-11

4. 2. 1 Powering up the SDT-10000/SDT-11000.................................................... 4-3

4. 2. 2 Inserting Cassettes ..................................................................................... 4-3

4. 2. 3 Removing Cassettes ................................................................................... 4-3

4. 2. 4 Write-Protecting Cassettes......................................................................... 4-3

4. 3. 1 The Load Sequence..................................................................................... 4-4

4. 3. 2 The Unload Sequence ................................................................................. 4-4

4. 3. 3 Power-Fail Handling .................................................................................... 4-4

4. 3. 4 Diagnostic and Normal Status Displays.................................................... 4-4

4. 3. 4. 1 Diagnostic Status Display ......................................................... 4-4

4. 3. 4. 1. 1 Front Panel Test.................................................... 4-5

4. 3. 4. 1. 2 Kernel Test ............................................................ 4-5

4. 3. 4. 2 Normal Status Display ............................................................... 4-6

4. 3. 4. 3 Media Warning............................................................................ 4-6

4. 4. 1 Tape Partitions............................................................................................. 4-7

4. 4. 1. 1 Formatting Partitions................................................................. 4-7

4. 5. 1 Head Cleaning.............................................................................................. 4-8

4. 5. 2 Troubleshooting Guide ............................................................................... 4-8

4. 5. 2. 1 Operational Problems ................................................................ 4-8

4. 5. 2. 2 Read/Write Problems ............................................................... 4-10

4. 5. 3 Clearance for Service................................................................................ 4-10

4. 5. 4 Packaging for Return to Sony .................................................................. 4-10

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4. OPERATION

4 OPERATION

4. 1 SUMMARY OF LED INDICATIONS

The SDT-10000/SDT-11000 LEDs have five (5) different methods of reporting the current status/operation of the drive:

LED function Meaning

Off Not active On Activity Flashing-1 Drive Activity Flashing-2 Warning Flash code 1, 2 Failure

Table 4-1: Possible LED indication meanings

The following table shows the meaning of each of the possible combinations of LED indications:

LED Busy Tape Status

Off Not Busy Unloaded On SCSI active Loaded Write Protected Flashing-1 Drive active Loading/Unloading Cleaning Tape at EOM Flashing-2 Error Rate Warning Cleaning Request Flash code 1 Waiting for Reset Waiting for Eject Flash code 2 Illegal FW Tape Selftest Failure

Table 4-2: Meaning of each LED indications

Flashing-1

0.25sec on / 0.25sec off

0.25sec

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4. OPERATION

Flashing-2

3.5sec on / 0.5sec off

3.5 sec

0.5 sec

Flash Code LED Indication: Flash code 1 (one pulse)

Flash code 2 (two pulses)

0.25sec

1.25sec

The following table shows the LED indication for each drive status/condition:

STATE LED

Activity Cartridge Other Busy Tape Status

None None None off off off

SCSI None None on off off Drive Loading/Unloading None Flashing-1 Flashing-1 off Drive Loading/Unloading Write Protected Flashing-1 Flashing-1 on None Loaded Cleaning Tape off on Flashing-1

at EOM

None Loaded None off on off

SCSI Loaded None on on off

SCSI/Drive Loaded None Flashing-1 on off

* Loaded Write Protected * on on * Loaded Error Rate Warning * Flashing-2 * * Cleaning Request * * Flashing-2 * * Selftest Failure * * Flash code 2 * * Waiting for Reset Flash code 1 * * * * Waiting for Eject * Flash code 1 *

Illegal FW Tape * Flash code 2 * Front Panel Test See 4.3.5.1

4 - 2

Table 4-3: LEDs indications for each state

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4. 2 OPERATOR ACTION

4. 2. 1 Powering up the SDT-10000/SDT-11000

After the initial installation of the SDT-10000/SDT-11000 has been verified, power can be applied to the unit. The +12V and +5V power must be applied simultaneously. The SDT-10000/SDT-11000 will execute a power-up diagnostic and then comes ready. Once the tape has been loaded the SDT-10000/SDT-11000 sends a CHECK CONDITION response on receipt of the next SCSI command from the host. The UNIT ATTENTION key is set in the returned REQUEST SENSE data to indicate that the tape may have been changed. (Sense Key/ASC/ASCQ = 06/28/00)

4. 2. 2 Inserting Cassettes

The operator inserts a cassette into the slot on the front panel with the arrow on the cassette pointing towards the drive. As the cassette is inserted, the drive takes it and automatically loads it into the drive mechanism. The SDT-10000/SDT11000 performs a tape load sequence as described in section 4.3.1.

4. 2. 3 Removing Cassettes

The cassette can be removed from the SDT-10000/SDT-11000 either in response to a SCSI UNLOAD command, or by pressing the Eject button. The operator uses the Eject button to initiate the unload sequence (see section 4.3.2). The mechanism winds the tape to Beginning of Media (BOM), unthreads it, and ejects the cassette from the slot. Note: Operation of the Eject button is disabled if the host has previously sent a SCSI PREVENT ALLOW MEDIA

REMOVAL command with prevent bit set to one. In this case, pressing the Eject button has no effect, and does not initiate an Unload sequence. The Eject button returns to normal operation following receipt of a PREVENT ALLOW MEDIA REMOVAL command with prevent bit clear.

4. 2. 4 Write-Protecting Cassettes

Cassettes can be write-protected by sliding the tab on the back of the cassette open. In this state, data can be read from the tape but not written to it. When a Write Protected tape is loaded in the drive the Tape and Status LEDs will be lit. The Busy LED will indicate any activity on the SCSI bus or mechanical motions in the drive itself. Caution: The Tape Log, which contains a history of usage of the tape, will not be updated when the cassette is write-

protected. It follows that the Tape Log becomes inaccurate if a cassette is used write-protected, and the media warning cannot be relied on to indicate that the cassette needs to be copied and replaced.

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4. OPERATION

4. 3 INTERNAL FUNCTION

4. 3. 1 The Load Sequence

During load sequence, the following occurs:

1. The drive mechanism accepts the cassette, threads the tape and rewinds to Beginning-of-Media (BOM). The tape is

then moved to Beginning-of-Tape (BOT) and the Reference area is checked to find the tape format (DDS-4, DDS3, DDS-2, DDS and DDS-DC, blank, audio, and so on). If the format is not DDS-4, DDS-3, DDS-2, DDS and DDSDC, the drive rewinds the tape to BOT and awaits either a WRITE, Partitioning MODE SELECT or an UNLOAD command.

2. The System area is then accessed and the System log read into the drive.

3. Finally the drive goes online.

In the case of two partition tape the drive detects that the tape has been formatted as a two partition tape when the Reference Area is read. The drive will then automatically position to the beginning of partition 0 before coming on-line. Partition 0 is the partition that begins the furthest from BOM.

4. 3. 2 The Unload Sequence

The drive will always write any buffered data out to tape followed by an EOD prior to initiating the Unload sequence. During this sequence the tape is rewound to BOT and, if the tape is write-enabled, the copy of the tape log held in RAM is written back to tape. The tape is then rewound to BOM and the tape unthreaded from the mechanism. At this stage the tape is either retained in the drive or ejected, depending on media removal is enabled by the PREVENT ALLOW MEDIA REMOVAL command. In the case of two partition tape the drive detects that the tape has been formatted as a two partition tape when the Reference Area is read during the load sequence. When the Unload operation begins the drive will then automatically update the Tape Log for each partition before unloading the tape.

4. 3. 3 Power-Fail Handling

If there is a power-fail, the SDT-10000/SDT-11000 performs the following actions, and reverts to its default configuration:

1. The drive remains positioned at the point where the power-fail or SCSI Reset occurred.

2. It executes the Power-Up sequence of self-tests. (When power is restored.)

3. If a tape is in the drive, the SDT-10000/SDT-11000 starts a load sequence.

The drive rewinds the tape to BOT and remains on-line.

4. The drive returns CHECK CONDITION status for the first command after the power-fail or Reset. The next

command from the initiator should be a REQUEST SENSE. The drive will return sense data including a sense key that will indicate that the drive has been reset. (Sense Key / ASC / ASCQ = 06/29/00)

4. 3. 4 Diagnostic and Normal Status Displays

This chapter describes LED displays while the SDT-10000/SDT-11000 is starting up. When power is turned on, the SDT-10000/SDT-11000 will go through its diagnostics to reach normal status. When a failure is detected during diagnostics, the LEDs show that the SDT-10000/SDT-11000 is out of order and needs to be repaired.

4. 3. 4. 1 Diagnostic Status Display

The SDT-10000/SDT-11000 starts with its Diagnostic function. This is made up of the Front Panel Test and the Kernel Test.

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4. OPERATION

4. 3. 4. 1. 1 Front Panel Test

LED display sequence:

Busy

0.25 sec

Note: This function is for checking BUSY, STATUS and TAPE LEDs and the related circuits. No errors can be gener-

ated as this test is only for operator verification of indicator operation.

Tape

Status

Front Panel Test

repeat until end of Power On Diagnostic

4. 3. 4. 1. 2 Kernel Test

After the Front Panel Test, the SDT-10000/SDT-11000 checks its internal units. Note: If a failure is detected, the SDT-10000/SDT-11000 displays the Failed Unit. Refer to section 4. 3. 4. When a Diagnostic error occurs, the SDT-10000/SDT-11000 must be powered off. The SDT-10000/SDT-11000 will not work and should be checked or repaired immediately. Note: The purpose of the diagnostic firmware is to test the SDT-10000/SDT-11000 electronics for functionality. If the

diagnostic request comes from the host through SCSI, then the results are reported through SCSI. If the electronics are not functioning, the diagnostic firmware tries to isolate the non-functional area to a specific Failed Unit. Given a failure, the firmware decides on an hierarchical basis which Unit to designate as the Most Suspect Failed Unit (MSFU). The confidence in this decision is intended to be 95%. The MSFU is identified and displayed on the front panel as shown above section 4. 3. 4. For the details of Diagnostics, see section 7.

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4. 3. 4. 2 Normal Status Display

After the Diagnostic Display, when no failures are detected, the SDT-10000/SDT-11000 is in the Normal Status. The LEDs show various Normal Status (No Error) indications as shown in the table below:

Activity Cartridge Other Busy Tape Status

None None None off off off

SCSI None None on off off Drive Loading/Unloading None Flashing-1 Flashing-1 off Drive Loading/Unloading Write Protected Flashing-1 Flashing-1 on

None Loaded Cleaning Tape off on Flashing-1

None Loaded None off on off

SCSI Loaded None on on off

SCSI/Drive Loaded None Flashing-1 on off

STATE LED

at EOM

* Loaded Write Protected * on on

Table 4-4: Normal LED indications

4. 3. 4. 3 Media Warning

When a Media Warning threshold is exceeded the drive will indicate that the tape is bad by flashing the Tape LED. The indicator will be on for 3.5 seconds, off for 0.5 seconds. The Busy and Status LEDs will operate normally. If this occurs, the data on the cassette should be copied onto a new one and the old cassette discarded. This status is cleared by unloading the cassette. The Media Warning is displayed if any of the following conditions are met:

- More than 1 RAW rewrite per 4 groups written

- More than 1 read retry per 512 groups read

- More than 1 ECC C3 error correction per 128 groups read

Note: Media warning is calculated as an average value of 1024 groups of data (either Read or Write) 1024 Groups of

data is approximately 390 MB.

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4. OPERATION

4. 4 TAPE FORMAT

The SDT-10000/SDT-11000 is an implementation of the Digital Data Storage (DDS) format, a standard developed by Sony and Hewlett-Packard for 4mm data storage drives. It incorporates the error correction techniques used in DAT audio drives with additional techniques specifically designed to provide the optimum level of data integrity. These extra methods of error detection and correction are:

- C3 ECC, third level Error Correction Code, providing correction across frames within groups

- Read-After-Write, where data is verified immediately after it is written and re-written if there is any error.

- N-Group Writing, where every group is repeated a set number of times. (DDS, DDS-DC, DDS-2 only)

- Randomizer, to reduce inter-symbol interference.

- Track checksums, to detect and locate helical errors, thereby improving the performance of C3 ECC.

4. 4. 1 Tape Partitions

Tapes can be formatted as a single data space or as two partitions. With two partitions, each has the same structure and can be written independently. So, for example, the partition further from BOM (Partition 0) can contain data files, and the partition closer to BOM (Partition 1) could contain a directory of these files, written later. With the exception of the Device area on the tape, each partition of a 2-partition tape is identical to a single data space tape in structure. This means each partition has its own Tape Log area; this is necessary because the patterns of usage may be very different for each partition. Similarly, each has its own Vendor Group, because the partitions might be written by different drives.

4. 4. 1. 1 Formatting Partitions

The SCSI MODE SELECT command is used to create partitions on a tape. The command can perform the following operations:

- Set up two partitions on a blank tape.

- Convert a single data space tape to a 2-partition tape.

- Convert a 2-partition tape to a single data space tape.

- Change the size of both partitions on a 2-partition tape.

- Resize the partitions of a 2-partition.

Note: Formatting is not needed for single partition operation. The MODE SELECT, Medium Partitions Parameters Page (11h) is used to Format the tape. MODE SELECT, Device Configuration Page (10h) is used to change from one partition to another, see the MODE SELECT Command description in the SCSI command section of this manual. The LOCATE Command also has the capability to select a partition prior to positioning. Any data on the tape before the format pass becomes inaccessible, even if the format pass is intended only to change the size of the two partitions. The Tape Logs are also destroyed and new logs created. If you do not format a new tape, it will be organized as a single data space tape. After data has been written to it, whether it was first initialized or not, a format pass is necessary to alter its characteristics and hence how it is handled by the tape drive system. Note: The format operation can be very time consuming depending on the requested size of the first partition on the

tape. The amount of time required can be approximated by use of the following formula:

- Number of Megabytes in Partition 1 x 1.4 = number of seconds required (DDS, DDS-DC, DDS-2)

- Number of Megabytes in Partition 1 x 0.5 = number of seconds required (DDS-3, 4)

- Add about 60 additional seconds for processing overhead

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4. OPERATION

4. 5 MAINTENANCE, TROUBLESHOOTING AND SERVICE

4. 5. 1 Head Cleaning

The SDT-10000/SDT-11000 has a built-in head cleaner designed to last for the life of the drive. In addition, a cleaning tape should be used periodically to clean the entire tape path. The drive will automatically request that the user perform a cleaning operation (described below). The need for a cleaning is determined by the length of time that the drum has been rotating since the last cleaning was performed. The drive will request a cleaning cycle after every 24 hours of drum rotation. The Cleaning Request is indicated by the Status LED flashing:

- on for 3.5 seconds

- off for 0.5 seconds

4. 5. 2 Troubleshooting Guide

Problems encountered while operating the Sony SDT-10000/SDT-11000 tape drive fall into two categories: Operational problems and Read/Write problems. Operational problems include any conditions that prevent the tape drive from operating. Operational problems usually are discovered the first time the drive is installed on a system or when the system configuration is changed or physically moved. Read/Write problems include conditions that effect the transfer of data to and from the tape drive. Commands such as REWIND, REQUEST SENSE and UNLOAD perform normally but data transfers fail. The following sections describe the recommended procedures for solving operational and read/write problems.

4. 5. 2. 1 Operational Problems

1. The tape drive will not accept a tape cartridge. Withdraw the tape cassette and turn the power to drive off, wait 5 seconds, then back on. Observe the drive for a normal power up sequence (See Section 4.3.4 ). If the LEDs do not light, check the power supply and power cable connection. If the drive completes the power on sequence normally but still won’t accept the tape cassette, the drive may be defective. A tape may already be in the drive. Tape LED is on. Press EJECT to remove the first tape. The power has been removed from the drive with a tape loaded. When the power is restored to the drive, it will detect the tape and rewind the tape to BOT. Press EJECT to remove the cassette.

2. A tape is in the drive and will not eject. If the SCSI command PREVENT ALLOW MEDIA REMOVAL (with Prevent bit set to one) has been sent to the drive, the cartridge will be retained in the drive even after an UNLOAD command. The EJECT button is also disabled. Send an PREVENT ALLOW MEDIA REMOVAL (with prevent bit clear) command, issue a SCSI bus reset, or power the drive off and back on to override this condition.

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4. OPERATION

If Tape is still in the drive after following the above procedure. The drive has a serious problem and should be returned to Sony for repair with the tape in place. Note: If it is absolutely mandatory that the tape cassette be removed prior to returning the drive for repair the following

Emergency Cassette Removal procedure should be followed.

Caution: This procedure should only be attempted by a mechanically qualified person and will probably result in the

tape being unusable. Do not proceed if further damage to the tape drive would be done.

Emergency Cassette Removal Procedure

1. Remove the drive from the chassis or enclosure to allow access to the bottom and left side of the drive.

2. Remove the drive’s top cover.

3. Locate the small opening in the bottom of the drive and insert the tip of a small screwdriver so that the Loading/

Threading motor shaft can be rotated.

4. Rotate the motor shaft clockwise to bring the threading mechanism back to the initial position.

5. Before continuing the manual eject procedure, tape slack must be removed in order to prevent tape damage. Repeat-

edly press the ratchet mechanism located on the left side of the drive to tighten the tape.

6. After the tape slack has been removed, continue to turn the motor shaft clockwise until the tape is lifted out of the

drive mechanism and is ejected.

7. Return the drive to Sony for repair. The following figure shows the drive access points for the Emergency Cassette Removal Procedure:

Figure 4-1: Emergency Tape Removal Procedure

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4. OPERATION

3. The drive powers up properly and loads and unloads tapes but will not respond to any SCSI commands.

A. If SCSI bus reset does not cause the drive to reset (same as power-on self test):

- Check the SCSI cable connectors

- Check SCSI cable pin one is aligned with the SCSI connector pin one

- Check for a broken cable or defective connector

- Try another known good SCSI device in the same location.

B. If SCSI bus reset causes the drive to reset then the problem is with the SCSI bus addressing or termination.

- Check that the SCSI bus ID jumper is set for the proper address

(See Section 3.1.1.)

- Check SCSI bus termination

The two SCSI devices at the ends of the bus should be terminated No other units should have terminators installed

Note: The strength of the SCSI bus signals can be affected if too many terminators are installed (Signal drivers can be

damaged as well)

4. 5. 2. 2 Read/Write Problems

To prevent read/write errors, follow the cleaning recommendation in section 4.5. If a read/write error occurs, a combination of the following steps should correct the problem.

- Remove the tape.

- Clean the drive with the DDS cleaning cartridge.

- Load a new tape in the drive.

- Retry the operation.

Note: If these steps do not correct the problem the drive may be defective and should be returned to Sony for service.

4. 5. 3 Clearance for Service

All servicing is performed only after removal of the SDT-10000/SDT-11000 from its mounting. It is recommended that in mounting the drive into a chassis provisions should be made to allow easy access to the mounting screws (see Figure 2-2).

4. 5. 4 Packaging for Return to Sony

The drive should be returned in its original packaging. Sony will not take responsibility for shipping damage caused to an improperly packaged drive.

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4. OPERATION

4. 6 DATA COMPRESSION

The tape capacity is increased by compressing data prior to writing it to the tape. Data compression is a well established technology for reducing the number of bits used to represent data in order to improve data transfer rate as well as reduce the amount of storage space consumed by the data. The SDT-10000/SDT-11000 uses the AK 8320 Data Compression IC from ASAHI KASEI MICROSYSTEMS. This chip provides a powerful data compression algorithm in a very small package. The data compression used by the chip is the DCLZ algorithm. DCLZ has been standardized (or is in the process of standardization) with the ANSI, ECMA and ISO standards organizations. The DDS Manufacturers Group (made up of representatives from active DDS Format Licensees) has agreed upon the DCLZ algorithm as the standard data compression algorithm for data interchange between DDS format drives. The DC control page allows the host computer to enable data compression and also configure the way in which the drive responds to compressed/uncompressed data boundaries on the tape. Note: The DDS format allows both compressed and uncompressed data to reside on the same tape. SDT-10000/SDT-11000 has a Dip switch to disable the Data Compression. After power-on reset with this jumper set, data compression is disabled. However, a MODE SELECT command can override the setting of this jumper. After power-on reset without this Dip switch set, both data compression and data decompression are enabled. (See

3.1.5) The more random the data is, the less compression is possible. This is due to the fact that data compression operates on the principle of reducing the redundancy in the data string and random data has very little redundancy. Data compression is a very powerful and reliable method increasing data capacity and transfer rate without compromising data reliability.

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5. SCSI INTERFACE

5. 1 INTRODUCTION ........................................................................................................ 5-1

5. 1. 1 Overview of the SCSI Interface .................................................................... 5-1

5. 1. 2 Supported Messages .................................................................................. 5-1

5. 1. 3 Supported and Unsupported Commands ................................................. 5-2

5. 2 SCSI BUS OPERATION ............................................................................................ 5-3

5. 2. 1 Typical SCSI Operation............................................................................... 5-3

5. 2. 2 Disconnect ................................................................................................... 5-3

5. 3 MESSAGE SPECIFICATION .................................................................................... 5-5

5. 3. 1 COMMAND COMPLETE (00h).................................................................... 5-5

5. 3. 2 EXTENDED MESSAGE (01h) ..................................................................... 5-5

5. 3. 2. 1 SYNCHRONOUS DATA TRANSFER REQUEST....................... 5-5

5. 3. 2. 2 WIDE DATA TRANSFER REQUEST.......................................... 5-7

5. 3. 3 SAVE DATA POINTER (02h) ..................................................................... 5-9

5. 3 .4 RESTORE POINTERS (03h) ........................................................................ 5-9

5. 3. 5 DISCONNECT (04h) ..................................................................................... 5-9

5. 3. 6 INITIATOR DETECTED ERROR (05h)....................................................... 5-9

5. 3. 7 ABORT (06h) .............................................................................................. 5-10

5. 3. 8 MESSAGE REJECT (07h)......................................................................... 5-10

5. 3. 9 NO OPERATION (08h) .............................................................................. 5-10

5. 3. 10 MESSAGE PARITY ERROR (09h)......................................................... 5-10

5. 3. 11 BUS DEVICE RESET (0Ch) ................................................................... 5-10

5. 3. 12 IGNORE WIDE RESIDUE (23h) ............................................................... 5-11

5. 4 STATUS SPECIFICATION...................................................................................... 5-12

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5. SCSI INTERFACE

5. 1 INTRODUCTION

The SDT-10000/SDT-11000 uses the SCSI interface to connect to the host system. The Small Computer System Interface (SCSI) is an industry standard interface, approved by the American National Standards Institute (ANSI). It is recommended that this document be used along with the ANSI standard document. The ANSI specification defines the interface in general while this document describes the specific implementation for this unit. The SCSI documents, listed in detail in section 1.2, offer the information required to integrate this unit with SCSIcompatible computer systems. This section is divided into four sub-sections:

• Introduction

• SCSI Bus Operation

• SCSI Messages

• SCSI Status

Note: The details of each SCSI Command are covered in section 6. The Introduction provides general, high-level information. For the hardware description and the installation requirements, see section 2. The SCSI protocol supported by the unit are covered in the Bus Operation, Message, and Status sections.

5. 1. 1 Overview of the SCSI Interface

The SCSI implementation provides the unit with a standard set of features and functions. These include:

• Asynchronous and Synchronous communication modes

• Single-ended / Differential Configurations

• Full implementation of Mandatory commands

• Implementation of most sequential non-Mandatory commands

5. 1. 2 Supported Messages

The following messages are supported: (alphabetic order)

* Abort * Bus Device Reset * Command Complete * Disconnect * Extended Message - Synchronous Data Transfer Request * Identify (w/ & w/o disconnect) * Initiator Detected Error * Message Parity Error * Message Reject * No Operation * Restore Pointers * Save Data Pointer

For implementation details on these messages, see the Message Specification section.

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5. SCSI INTERFACE

5. 1. 3 Supported and Unsupported Commands

The following commands are supported. They include all Mandatory and Extended commands, most Optional commands.

Command Name Code

ERASE 19h INQUIRY 12h LOAD/UNLOAD 1Bh LOCATE 2Bh LOG SELECT 4Ch LOG SENSE 4Dh MODE SELECT(6) 15h MODE SENSE(6) 1Ah PREVENT ALLOW MEDIUM REMOVAL 1Eh READ 08h READ BLOCK LIMITS 05h READ BUFFER 3Ch READ POSITION 34h RECEIVE DIAGNOSTIC RESULTS 1Ch RELEASE UNIT 17h REPORT DENSITY SUPPORT 44h REPORT LUNS A0h REQUEST BLOCK ADDRESS 02h REQUEST SENSE 03h RESERVE UNIT 16h REWIND 01h SEEK BLOCK 0Ch SEND DIAGNOSTIC 1Dh SPACE 11h TEST UNIT READY 00h VERIFY 13h WRITE 0Ah WRITE BUFFER 3Bh WRITE FILEMARKS 10h

Operation

5 - 2

Table 5-1: Supported SCSI Commands

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5. SCSI INTERFACE

For implementation details on these commands, see the Command section. The following Optional commands are NOT supported.

- CHANGE DEFINITION

- COMPARE

- COPY AND VERIFY

- 10 byte MODE SENSE & MODE SELECT

- READ REVERSE

- TRACK SELECT (SCSI-1 optional command, not applicable to the SDT-10000/SDT-11000)

5. 2 SCSI BUS OPERATION

5. 2. 1 Typical SCSI Operation

This example describes the typical SCSI bus sequence between the host and the drive.

1. After waiting for the bus clear time the Host arbitrates for the SCSI bus. It does this by asserting BSY and the data line corresponding to its bus ID. If any other devices wish to compete for the bus, they also assert BSY and the appropriate data line. Each arbitrating device then inspects the data bus. The device with the highest ID wins the bus. All the other devices must release BSY and their data lines.

2. The Host attempts to select the target by asserting SEL and releasing BSY. The Host maintains its ID and asserts the target’s ID on the data bus. Each target then checks the data lines. If the target’s ID matches that on the data bus, it accepts selection by asserting BSY. Once the Host has detected BSY being asserted, it asserts ATN to indicate that it wants the target to go to the MESSAGE OUT phase. The Host releases SEL.

3. The target now has control of the SCSI bus and it is the target which switches between phases. The target responds to the ATTENTION condition and initiates the MESSAGE OUT phase. The Host sends an IDENTIFY message which tells the target which logical unit the Host wishes to talk to. The fact that the target responds to the ATN indicates to the Host that the target can accommodate more than just a COMMAND COMPLETE message.

4. The target initiates the COMMAND phase and transfers the Command Descriptor Block from the Host. In the COMMAND phase, the target decodes the command and either executes the command (TEST UNIT READY) or sets itself up for a data transfer to the Host (READ, WRITE, INQUIRY etc.). The target then either switches to the STATUS phase, if the command is complete, or if it is ready to transfer data, the DATA phase.

5. The data transfer length is set by the Host in the Command Descriptor Block. The target will remain in the DATA phase until all the data is transferred.

6. The target then initiates a STATUS phase and transfers one byte to the Host to indicate whether the target has successfully completed the command. If the target has detected an error, the next command that the Host is expected to send is REQUEST SENSE. This allows the target to return further status information to the Host.

7. The target completes the SCSI sequence by going to the MESSAGE IN phase and transferring a COMMAND COMPLETE message to the Host. The target then releases BSY allowing the bus to go to the BUS FREE state.

5. 2. 2 Disconnect

In order to improve bus usage and performance, the unit is capable of temporarily disconnecting from the bus, consequently allowing other initiator-target communications to take place. To do so, however, the Host needs to support Disconnect/Reselect. The mechanism for performing the Disconnect/Reselect procedure is implemented as follows:

1. The Host arbitrates for the SCSI bus and upon winning the bus it proceeds to select target device. Prior to releasing SEL and completing the selection phase, the Host asserts the ATN line. The Host then releases SEL and BSY to allow the target to assume control of the SCSI bus. By asserting ATN, the host indicates that the target should go to a MESSAGE OUT phase.

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2. At this point, the target responds to the Host ATTENTION condition by initiating a MESSAGE OUT phase and receiving a message from the Host which tells it whether or not the Host allows Disconnects for the desired logical unit on the target.

3. If the Host does not send an Identify message, the target assumes that Disconnects are not permitted.

4. The I/O activity from this point is controlled entirely by the target. The target initiates the COMMAND phase and reads in the Command Descriptor Block (CDB) from the Host. If the Host has sent an Identify message with the Disconnect permission bit set, then the target will immediately disconnect from the bus after the entire CDB has been received.

5. The Disconnect process occurs when the target initiates a MESSAGE IN phase and sends a DISCONNECT message back to the Host. This message may be preceded by a SAVE DATA POINTERS message byte if the Disconnect is performed in the middle of the DATA phase. Following the MESSAGE IN phase, the target frees the bus by releasing the BSY.

6. The host now waits for the target to perform Reselection. When ready, the target reselects the Host and sends an Identify message via a MESSAGE IN phase, indicating the specific logical unit with which the subsequent communications are to take place. Usually, the target will proceed from the MESSAGE IN phase to either a DATA or a STATUS phase. If the Host had been previously told to SAVE DATA POINTERS, then the target’s Identify message implies that the Host restores its data pointers upon reselection; in other words, it is not necessary for the target to send a specific RESTORE DATA POINTERS to the Host in such context.

7. When doing a large data transfer, the target may choose to divide the entire transfer into several smaller transfers. This allows the target to free the SCSI bus whenever it needs to perform its own system tasks not immediately related to the actual data transfer over the SCSI bus. The target will not lock the bus into the DATA phase if it is not presently ready to efficiently execute the transfer. After the data transfer is completed, the target enters a STATUS phase and sends a single status byte to the Host. It then proceeds to a MESSAGE IN phase, during which the target sends a COMMAND COMPLETE message. Finally, the target frees the bus and the current command is considered completed.

8. The Host may change Disconnect permission at any time after the SELECTION phase by asserting ATN and sending an Identify message via a MESSAGE OUT phase. If the Host, however, performs this action during a DATA phase, it is possible that the target will not notice the change in Disconnect permission status until past the end of the current bus phase.

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5. 3 MESSAGE SPECIFICATION

This section includes all SCSI messages. Both supported and non-supported messages are listed. Elements of this section come from section 5, Logical Characteristics, of the SCSI standard. The message system allows communication between an initiator and a target for the purpose of physical path management. The table below lists the Messages supported by the SDT-10000/SDT-11000.

Code Description Direction

In Out 00 COMMAND COMPLETE * 01 EXTENDED MESSAGE (Note 1) * * 02 SAVE DATA POINTER * 03 RESTORE POINTERS * 04 DISCONNECT * 05 INITIATOR DETECTED ERROR * 06 ABORT * 07 MESSAGE REJECT * * 08 NO OPERATION * 09 MESSAGE PARITY ERROR * 0C BUS DEVICE RESET * 23 IGNORE WIDE RESIDUE * 80- FF IDENTIFY * *

Table 5-2: Message Descriptions

Note: The SDT-10000/SDT-11000 supports the Synchronous Data Transfer Request Extended Message.

5. 3. 1 COMMAND COMPLETE (00h)

This message is sent from a target to an initiator to indicate that the execution of a command has completed and valid status has been sent to the initiator. After successfully sending this message, the target goes to the BUS FREE phase by releasing BSY. When received as a target, it will be handled as an illegal message, the unit will return MESSAGE REJECT and will continue.

5. 3. 2 EXTENDED MESSAGE (01h)

5. 3. 2. 1 SYNCHRONOUS DATA TRANSFER REQUEST

This is sent by either the initiator or the target as the first byte of a multiple-byte message. When acting as an initiator, the unit will not send any Extended Messages. No Vendor Unique codes are implemented and only the Synchronous Data Transfer Request code is supported. Any other message code is handled as an illegal message; the unit will return MESSAGE REJECT and will continue. A Synchronous Data Transfer Request message has the following format:

Byte Value Description

0 01h Extended message 1 03h Extended message length 2 01h SYNCHRONOUS DATA TRANSFER REQUEST code 3 m Transfer period (m times 4 nanoseconds) 4 x REQ/ACK offset

Table 5-3: Synchronous Data Transfer Request

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A SYNCHRONOUS DATA TRANSFER REQUEST (SDTR) message exchange shall be initiated by an SCSI device whenever a previously-arranged data transfer agreement may have become invalid. The agreement becomes invalid after any condition which may leave the data transfer agreement in an indeterminate state such as:

(1) after a hard reset condition (2) after a BUS DEVICE RESET message and

(3) after a power cycle In addition, an SCSI device may initiate an SDTR message exchange whenever it is appropriate to negotiate a new data transfer agreement (either synchronous or asynchronous). SCSI devices that are capable of synchronous data transfers shall not respond to an SDTR message with a MESSAGE REJECT message.

The SDTR message exchange establishes the permissible transfer periods and the REQ/ACK offsets for all logical units and target routines on the two devices. This agreement only applies to data phases. The transfer period factor times four is the value of the transfer period.

Transfer period is the minimum time allowed between leading edges of successive REQ pulses and of successive ACK pulses. The SDT-10000/SDT-11000 supports the following transfer periods:

Transfer Period (hex) 0C 19 1F 26 2C 32 38

Transfer Rate (MB/sec) - narrow 20.0 10.0 8.0 6.67 5.71 5.00 4.44

Transfer Rate (MB/sec) - wide 40.0 20.0 16.0 13.34 11.42 10.00 8.88

Table 5-4: Synchronous Data Transfer Rates

REQ/ACK offset: is the maximum number of REQ pulses allowed to be outstanding before the leading edge of its corresponding ACK pulse is received at the target. A REQ/ACK offset value of ZERO shall indicate asynchronous data transfer mode. The SDT-10000/SDT-11000 supports synchronous data transfer REQ/ACK offset values from 1 to 15.

The originating device (the device that sends the first of the pair of SDTR messages) sets its values according to the rules above to permit it to receive data successfully. If the responding device can also receive data successfully with these values (or smaller transfer periods or larger REQ/ACK offsets or both), it returns the same values in its SDTR message. If it requires a larger transfer period, a smaller REQ/ACK offset, or both in order to receive data successfully, it substitutes values in its SDTR message as required, returning unchanged any value not required to be changed. Each device when transmitting data shall respect the limits set by the other’s SDTR message, but it is permitted to transfer data with larger transfer periods, smaller REQ/ACK offsets, or both than specified in the other’s SDTR message. The successful completion of an exchange of SDTR messages implies an agreement as follows:

Responding Device SDTR response Implied Agreement

(1) Non-ZERO REQ/ACK offset Each device transmits data with a transfer period equal to or greater than

and a REQ/ACK offset equal to or less than the values received in the other

device’s SDTR message. (2) REQ/ACK offset equal to ZERO Asynchronous transfer (3) MESSAGE REJECT message Asynchronous transfer

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If the initiator recognizes that negotiation is required, it asserts the ATN signal and sends a SDTR message to begin the negotiating process. After successfully completing the MESSAGE OUT phase, the target shall respond with the proper SDTR message. If an abnormal condition prevents the target from returning an appropriate response, both devices shall go to asynchronous data transfer mode for data transfers between the two devices.

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Following target response (1) above, the implied agreement for synchronous operation shall be considered to be negated by both the initiator and the target if the initiator asserts the ATN signal and the first message out is either MESSAGE PARITY ERROR or MESSAGE REJECT. In this case, both devices shall go to asynchronous data transfer mode for data transfers between the tow devices. For the MESSAGE PARITY ERROR case, the implied agreement shall be reinstated if a re-transmittal of the second of the pair of messages is successfully accomplished. After two retry attempts, if the target receives a MESSAGE PARITY ERROR message, it shall terminate the retry activity. This may be done either by changing to any other information transfer phase and transferring at least one byte of information or by going to the BUS FREE phase. The initiator shall accept such action as aborting the negotiation, and both devices shall go to asynchronous data transfer mode for data transfer between the two devices.

If the target recognizes that negotiation is required, it sends an SDTR message to the initiator. Prior to releasing the ACK signal on the last byte of the SDTR message from the target, the initiator shall assert the ATN signal and respond with its SDTR message or with a MESSAGE REJECT message. If an abnormal condition prevents the initiator from returning an appropriate response, both devices shall go to asynchronous data transfer mode for data transfers between the two devices.

Following an initiator’s responding SDTR message, an implied agreement for synchronous operation shall not be considered to exist until the target leaves the MESSAGE OUT phase, indicating that the target has accepted the negotiation. After two retry attempts, if the target has not received the initiator’s responding SDTR message, it shall go to the BUS FREE phase without any further information transfer attempt. This indicates that a catastrophic error condition has occurred. Both devices shall go to asynchronous data transfer mode for data transfer between the two devices.

If, following an initiator’s responding SDTR message, the target shifts to MESSAGE IN phase and the first message in is MESSAGE REJECT, the implied agreement shall be considered to be negated and both devices shall go to asynchronous data transfer mode for data transfers between the two devices.

The implied synchronous agreement shall remain in effect until a BUS DEVICE RESET message is received, until a hard reset condition occurs, or until one of the two SCSI devices elects to modify the agreement. The default data transfer mode is asynchronous data transfer mode. The default data transfer mode is entered at power on, after a BUS DEVICE RESET message, or after a hard reset condition.

5. 3. 2. 2. WIDE DATA TRANSFER REQUEST Byte Value Description

0 01h Extended message 1 03h Extended message length 2 01h WIDE DATA TRANSFER REQUEST code 3 m Transfer Width exponent

A WIDE DATA TRANSFER REQUEST (WDTR) message exchange shall be initiated by an SCSI device whenever a previously-arranged transfer width agreement may have become invalid. The agreement becomes invalid after any condition which may leave the data transfer agreement in an indeterminate state such as:

(1) after a hard reset condition (2) after a BUS DEVICE RESET message and (3) after a power cycle

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In addition, an SCSI device may initiate a WDTR message exchange whenever it is appropriate to negotiate a new transfer width agreement. SCSI devices that are capable of wide data transfers (greater than eight bits) shall not respond to a WDTR with a MESSAGE REJECT message.

The WDTR message exchange establishes an agreement between two SCSI devices on the width of the data path to be used for DATA phase transfers between the two devices. This agreement applies to DATA IN and DATA IN and DATA OUT phase only. All other information transfer phase shall use an eight-bit data path.

If an SCSI device implements both wide data transfer option and synchronous data transfer option, then it shall negotiate the wide data transfer agreement prior to negotiating the synchronous data transfer agreement. If a synchronous data transfer agreement is in effect, then an SCSI device that accepts a WDTR message shall reset the synchronous agreement to asynchronous mode.

The transfer width is two to the transfer width exponent bytes wide. The transfer width that is established applies to an logical units on both SCSI devices. Valid transfer widths are 8 bits (m=00h), and 16 bits (m=01h). Values of m=02 and greater are reserved.

The originating SCSI device (the SCSI device that sends the first of the pair of WDTR messages) sets its transfer width value to maximum data path width it elects to accommodate. If the responding SCSI device can also accommodate this transfer width, it returns the same value in its WDTR message. If it requires a smaller transfer width, it substitutes the smaller value in its WDTR message. The successful completion of an exchange of WDTR messages implies an agreement as follows:

Responding Device WDTR response Implied Agreement

a) Non-ZERO transfer width Each device transmits and receives data with a transfer width equal to the

responding SCSI device’s transfer width. b) Transfer width equal to ZERO Eight-bit data transfer c) MESSAGE REJECT message Eight-bit data transfer

If the initiator recognizes that negotiation is required, it asserts the ATN signal and sends a WDTR message to begin the negotiating process. After successfully completing the MESSAGE OUT phase, the target shall respond with the proper WDTR message. If an abnormal condition prevents the target from returning an appropriate response, both devices shall go to eight-bit data transfer mode for data transfers between the two devices.

Following target response (1) above, the implied agreement for wide data transfers shall be considered to be negated by both the initiator and the target if it the initiator asserts ATN and the first message out is either MESSAGE PARITY ERROR or MESSAGE REJECT. In this case, both devices shall go to eight-bit data transfer mode for data transfers between the two devices. For the MESSAGE PARITY ERROR case, the implied agreement shall be reinstated if a retransmittal of the second of the pair of messages is successfully accomplished. After a vendor-specific number of retry attempts (greater than ZERO), if the target receives a MESSAGE PARITY ERROR message, it shall terminate the retry activity. This may be done either by changing to any other information transfer phase and transferring at least on byte of information or by going to the BUS FREE phase. The initiator shall accept such action as aborting the negotiation and both devices shall go to eight-bit data transfer mode for data transfers between the two devices.

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The implied transfer width agreement shall remain in effect until a BUS DEVICE RESET message is received, until a hard reset condition occurs, or until one of the two SCSI devices elects to modify the agreement. The default data transfer width is eight-bit data transfer mode. The default data transfer mode is entered at power on m, after a BUS DEVICE RESET message, or after a hard reset condition.

5. 3. 3 SAVE DATA POINTER (02h)

This message is sent from a target to the initiator at the end of a Data Phase to request that the initiator save a copy of the present active data pointer for the currently attached logical unit. As a target, it will send this message prior to a disconnect. When received as a target, it will be handled as an illegal message, the unit will return MESSAGE REJECT and will continue

5. 3 .4 RESTORE POINTERS (03h)

This message is sent from a target to direct the initiator to restore the most recently saved pointers for the currently attached logical unit to the active state. Pointers to the command, data, and status locations for the logical unit will be restored to the active pointers. Command and status pointers will be restored to the beginning of the present command and status areas. The data pointer will be restored to the value at the beginning of the data area in the absence of a SAVE DATA POINTER message or to the value at the point at which the last SAVE DATA POINTER message occurred for that logical unit. The unit sends a RESTORE POINTERS message before resending a previously unsuccessful status or data transfer. It doesn’t send a RESTORE POINTERS for re-selection but relies on the implicit restore pointers in a re-selection. When received as a target, it will be handled as an illegal message; the unit will return MESSAGE REJECT and will continue.

5. 3. 5 DISCONNECT (04h)

This message is sent from a target to inform an initiator that the present physical path is going to be broken (the target plans to disconnect by releasing BSY). Later, reselection will be required in order to complete the current operation. Note: The initiator detects a catastrophic error condition when the BUS FREE phase occurs (other than as result of a

RESET condition) without first receiving a DISCONNECT or COMMAND COMPLETE message. If the target intentionally creates this condition, the target clears the current command. This message does not cause the

initiator to save the data pointer. As a target, the unit supports this message and will disconnect if allowed by the initiator. When received as a target, it will be handled as an illegal message; the unit will return MESSAGE REJECT and will continue.

5. 3. 6 INITIATOR DETECTED ERROR (05h)

This message is sent from an initiator to inform a target that an error (e.g.: parity error) has occurred that does not prevent the target from re-trying the operation. At this point, present pointer integrity is not assured. A RESTORE POINTERS message or a disconnect followed by a reselection, will cause the pointers to be restored to their previously defined state. When received as a target the unit will attempt to retry the phase and if unsuccessful then enter the status phase reporting CHECK CONDITION with the sense key set to COMMAND ABORTED.

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5. 3. 7 ABORT (06h)

This message is sent from the initiator to the target to clear the present operation. All pending data and status from the affected logical unit is cleared, and the target goes to the BUS FREE phase. This message can be sent to a logical unit that is not currently performing an operation for the initiator. A transaction which has not yet been acknowledged with a good Status byte will cause the transaction to be aborted. If a transaction has already been acknowledged, the abort will force a Write of any pending data. The device will proceed directly to BUS FREE state.

5. 3. 8 MESSAGE REJECT (07h)

This message is sent from either the initiator or target to indicate that the last message it received was inappropriate or has not been implemented. In order to indicate its intentions of sending this message, the initiator asserts the ATN signal prior to its release of ACK for the REQ ACK handshake of the message that is to be rejected. Message Reject is issued in response to any messages which the unit considers to be illegal or not supported. The illegal message will cause the current command to be aborted and the unit will enter the status phase reporting CHECK CONDITION with the sense key set to COMMAND ABORTED. When received as a target, if the unit was previously in Message In phase (i.e.: sending messages to the host) then MESSAGE REJECT will cause the unit to go straight to the Status phase with a CHECK CONDITION status and a sense key of COMMAND ABORTED. If the unit was not previously in Message In phase then MESSAGE REJECT will be handled as an illegal message. If the initiator sends MESSAGE REJECT message in response to the unit DISCONNECT message, the unit will disable disconnects for the rest of the nexus and continue.

5. 3. 9 NO OPERATION (08h)

This message is sent by an initiator in response to a target’s request for a message when the initiator does not currently have any other valid message to send. This message is accepted when the drive is acting as a target. When a NO-OP is received during any phase, the unit will continue as though nothing had happened.

5. 3. 10 MESSAGE PARITY ERROR (09h)

This message is sent from the initiator to the target to indicate that one or more bytes in the last message it received had a parity error. To indicate its intentions of sending this message, the initiator will send the ATN signal prior to its release of ACK for the REQ/ACK handshake of the message that has the parity error. This provides an interlock so that the target can determine which message has the parity error. This message will not be sent by the drive. When received as a target, the unit will return MESSAGE REJECT and will continue.

5. 3. 11 BUS DEVICE RESET (0Ch)

This message is sent from an initiator to direct a target to clear all current commands. Upon recognizing this message, the currently executing command will be aborted and the drive will proceed to the BUS FREE state. The drive will then execute a hard reset which will leave the drive in a state as if it had been power-cycled. All data in the buffer will be written to tape before the reset is performed. A BUS DEVICE RESET message should be used to reset the drive, rather than a hard reset, as this will only reset the drive rather than all the devices on the bus. Due to the catastrophic nature of this command, it should be used cautiously in a multi-initiator system.

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5. 3. 12 IGNORE WIDE RESIDUE (23h)

Byte Value

0 23 Message Code 1 01 Ignore

Table 5-5: Ignore Wide Residue Message

The IGNORE WIDE RESIDUE message (see table 5-5) shall be sent from the SDT-10000/SDT-11000 to indicate that the number of valid bytes sent during the last REQ/ACK handshake and REQB/ACKB handshake of a DATA IN phase is less than the negotiate transfer width. The ignore field indicates the number of invalid data bytes transferred. This message shall be sent immediately following that DATA IN phase and prior to any other massages. The ignore field is defined in table 5-6. More than one IGNORE WIDE RESIDUE message may occur during an I/O process..

Ignore

00h Reserved 01h DB (15-8)

02-FFh Reserved

Invalid data bits

16-bit transfers

Table 5-6: Ignore Field

Even though a byte is invalid its corresponding parity bit shall be valid for the value transferred.

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5. 4 STATUS SPECIFICATION

A Status byte is sent from the drive to the Host during the STATUS phase at the termination of each command as specified in the SCSI specification, unless the command has been cleared by an ABORT message, by a BUS DEVICE RESET message, or by a hard RESET. The Status bytes that will be return are:

00h GOOD: This status indicates that the drive has successfully completed the command. 02h CHECK CONDITION: Any error, exception, or abnormal condition that causes sense data to be set returns

CHECK CONDITION. The REQUEST SENSE command should be sent following this status to determine the nature of the error.

08h BUSY: The drive is busy. This status is returned whenever the drive is unable to accept a command from an

otherwise acceptable initiator. The BUSY status will be returned by the unit, if, while it is DISCONNECTED from the SCSI bus, it receives a command from a different initiator. The unit does not stack commands and therefore will not accept the next command until the current one has completed. Note that if an initiator sends overlapped commands to the unit (i.e.: it sends a new command while the previous one is still executing and the unit is disconnected) then the first command will be aborted and a CHECK CONDITION will be returned to the initiator to indicate that the command was aborted. The second command will NOT be executed. The BUSY status returned by the drive must not be confused with DRIVE NOT READY. DRIVE NOT READY will be returned as part of the Sense data following a REQUEST SENSE command and indicates that the drive is offline and no media is loaded in the drive. The drive is deemed offline if the tape is currently unloaded and, normally, ejected from the drive. However, the drive will still be offline if the tape has been retained within the drive following a Host issued PREVENT MEDIA REMOVAL command prior to the unload. In the offline state, the Host cannot perform any operation which would cause tape motion. These commands will return a CHECK CONDITION status with a DRIVE NOT READY sense key set. The command types which are not allowed are write, read, verify or space commands. The Host may load the tape when the unit is offline so long as the tape has been prevented from being ejected via the PREVENT/ALLOW MEDIA REMOVAL command.

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While the drive is “Busy” the Host may issue any commands, including diagnostic commands, which do not access the tape and a GOOD status shall be returned. These commands are:

INQUIRY LOG SELECT LOG SENSE MODE SELECT MODE SENSE PREVENT ALLOW MEDIUM REMOVAL READ BLOCK LIMITS READ BUFFER RECEIVE DIAGNOSTIC RESULTS RELEASE UNIT REQUEST SENSE RESERVE UNIT SEND DIAGNOSTIC WRITE BUFFER

The TEST UNIT READY command is used to determine the online/offline state of the drive and will, therefore, return a CHECK CONDITION status with a DRIVE NOT READY sense key set if no media is currently loaded.

18h RESERVATION CONFLICT: This status is returned by the drive whenever the host or another SCSI device

attempts to access the drive if it has been reserved via the RESERVE UNIT command.

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6. 01 ERASE 19h ............................................................................................................. 6-3

6. 02 INQUIRY 12h........................................................................................................... 6-4

6. 03 LOAD/UNLOAD 1Bh .............................................................................................. 6-9

6. 04 LOCATE 2Bh ........................................................................................................ 6-11

6. 05 LOG SELECT 4Ch ............................................................................................... 6-12

6. 06 LOG SENSE 4Dh ................................................................................................. 6-15

6. 06. 1 The Log Page Descriptor ......................................................................... 6-18

6. 06. 2 The Log Parameter Descriptor ................................................................ 6-19

6. 06. 3 Supported Log Pages .............................................................................. 6-21

6. 06. 3. 1 Summary List of Supported Pages ...................................... 6-21

6. 06. 4 Write and Read Error Counters Pages ................................................... 6-22

6. 06. 5 Last N Error Events List........................................................................... 6-24

6. 06. 6 Tape Log Page (Sony Unique)................................................................. 6-25

6. 06. 7 Tape Capacity Log Page .......................................................................... 6-27

6. 06. 8 Drive Usage Log Page (Sony Unique) .................................................... 6-28

6. 06. 9 Data Compression Transfer Log Page ................................................... 6-30

6. 07 MODE SELECT 15h............................................................................................. 6-32

6. 07. 1 Disconnect-Reconnect Page ................................................................... 6-38

6. 07. 2 Data Compression Control Page ............................................................ 6-40

6. 07. 3 Device Configuration Page...................................................................... 6-43

6. 07. 4 Medium Partitions Parameter Page ........................................................ 6-47

6. 08 MODE SENSE 1Ah .............................................................................................. 6-50

6. 09 PREVENT ALLOW MEDIUM REMOVAL 1Eh .................................................. 6-54

6. 10 READ 08h .............................................................................................................. 6-55

6. 11 READ BLOCK LIMITS 05h................................................................................. 6-58

6. 12 READ BUFFER 3Ch ............................................................................................ 6-59

6. 13 READ POSITION 34h .......................................................................................... 6-61

6. 14 RECEIVE DIAGNOSTIC RESULTS 1Ch............................................................ 6-64

6. 15 RELEASE UNIT 17h ............................................................................................ 6-67

6. 16 REPORT DENSITY SUPPORT............................................................................ 6-68

6. 17 REPORT LUNS A0h ............................................................................................ 6-73

6. 18 REQUEST BLOCK ADDRESS 02h.................................................................... 6-74

6. 19 REQUEST SENSE 03h ........................................................................................ 6-75

6. 20 RESERVE UNIT 16h ............................................................................................ 6-86

6. 21 REWIND 01h ......................................................................................................... 6-87

6. 22 SEEK BLOCK (0Ch) ............................................................................................. 6-88

6. 23 SEND DIAGNOSTIC 1Dh ..................................................................................... 6-89

6. 24 SPACE 11h ........................................................................................................... 6-92

6. 25 TEST UNIT READY 00h ..................................................................................... 6-95

6. 26 VERIFY 13h........................................................................................................... 6-96

6. 27 WRITE 0Ah ........................................................................................................... 6-98

6. 28 WRITE BUFFER 3Bh......................................................................................... 6-100

6. 29 WRITE FILEMARKS 10h .................................................................................... 6-102

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6. COMMAND SPECIFICATION

This section includes all supported and unsupported SCSI commands. Elements of this section come from sections 7, 8 and 9 of the ANSI X3T9.2, SCSI interface specification. There are different types of SCSI commands, each with a specific, required length (in bytes.) The majority of the commands are 6 byte Group 0 commands. Group 1 & 2 commands are 10 bytes long. Note that the drive will wait until the required number of bytes are transferred. At the termination of each command, the target sends a status byte to the initiator. See the section on Status for more details. All SDT-10000/SDT-11000 SONY unique commands are in Group

7. Group 7 commands are 6 bytes long.

The following is a list of the supported SCSI Commands and page index:

PARA SCSI COMMAND OP CODE PAGE

6.01 ERASE 19h 6-3

6.02 INQUIRY 12h 6-4

6.03 LOAD/UNLOAD 1Bh 6-9

6.04 LOCATE 2Bh 6-11

6.05 LOG SELECT 4Ch 6-12

6.06 LOG SENSE 4Dh 6-15

6.07 MODE SELECT (6) 15h 6-32

6.08 MODE SENSE (6) 1Ah 6-50

6.09 PREVENT ALLOW MEDIUM REMOVAL 1Eh 6-54

6.10 READ 08h 6-55

6.11 READ BLOCK LIMITS 05h 6-58

6.12 READ BUFFER 3Ch 6-59

6.13 READ POSITION 34h 6-61

6.14 RECEIVE DIAGNOSTIC RESULTS 1Ch 6-64

6.15 RELEASE UNIT 17h 6-67

6.16 REPORT DENSITY SUPPORT 44h 6-68

6.17 REPORT LUNS A0h 6-73

6.18 REQUEST BLOCK ADDRESS 02h 6-74

6.19 REQUEST SENSE 03h 6-75

6.20 RESERVE UNIT 16h 6-86

6.21 REWIND 01h 6-87

6.22 SEEK BLOCK 0Ch 6-88

6.23 SEND DIAGNOSTIC 1Dh 6-89

6.24 SPACE 11h 6-92

6.25 TEST UNIT READY 00h 6-95

6.26 VERIFY 13h 6-96

6.27 WRITE 0Ah 6-98

6.28 WRITE BUFFER 3Bh 6-100

6.29 WRITE FILEMARKS 10h 6-102

Table 6-1: SCSI Commands and Page Index

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6. COMMAND SPECIFICATION

Note: In compliance with the SCSI specification, the unit will terminate the command with a CHECK CONDITION

status and the sense key will be set to ILLEGAL REQUEST when a reserved bit, byte, field or code is not zero.

The unit has an embedded SCSI controller interface and therefore is a single target, single logical unit device when on the SCSI bus. The Logical Unit Number for the drive is fixed and is set to zero. In order to be SCSI-2 compatible, the following scheme is used to check the LUN:

SCSI-2 states that the LUN addressed by the host should appear in the IDENTIFY message sent to the target on selection. If SDT-10000/SDT-11000 receives an IDENTIFY message with a LUNTRN field of zero, then it will not check the LUN field in the CDB (ANSI have reserved the right to reclaim the LUN field in the CDB in the next release of SCSI and has recommended that this field not be used in SCSI-2 compatible devices). However, SCSI-1 and SCSI-2 devices are allowed to coexist on the same bus, and SCSI-1 hosts will not send an IDENTIFY message. If SDT-10000/SDT11000 does NOT receive an IDENTIFY message on selection then it WILL check the LUN field in the CDB and expect it to be zero. If it isn’t the unit will return a CHECK CONDITION status with an ILLEGAL REQUEST sense key set.

SCSI Commands

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6. COMMAND SPECIFICATION

6. 01 ERASE 19h

Bit76543210

Byte

0 Operation Code (19h) 1 Logical Unit Number Reserved Immed Long 2 Reserved 3 Reserved 4 Reserved 5 Unused (00b) Reserved

ERASE causes part or all of the remaining data within a partition be erased beginning at the current logical position. Any write data that is currently held in the buffer is written to tape before the ERASE is executed. Immed:

If the Immediate bit is set to zero, the drive will not return status until the selected operation has completed. If the bit is set, status will be returned as soon as the operation has been initiated.

Long:

The Long bit controls the distance to be erased. If the bit is set to 1, the drive will write EOD from the current logical position till the end of current partition. If the bit is set to 0, the drive will write only 300 frames (for DDS-1) or 450 frames (for DDS-2, DDS-3 or 600 frames (DDS-4)) of EOD from the current logical position.

␣␣

ERASE

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6. COMMAND SPECIFICATION

6. 02 INQUIRY 12h

Bit76543210

Byte

0 Operation Code (12h) 1 Logical Unit Number Reserved CmdDT EVPD 2 Page Code (00h) 3 Reserved 4 Allocation Length (24h) 5 Unused (00b) Reserved

INQUIRY tells the drive to send information regarding the drive parameters to the initiator. EVPD:

The drive does not support the Vital Product Data option. Therefore, the Enable Vital Product Data bit must be set to zero otherwise the drive returns a CHECK CONDITION status with an ILLEGAL REQUEST Sense Key.

Page Code:

This field is not supported and must be set to zero otherwise the drive returns a CHECK CONDITION status with an ILLEGAL REQUEST Sense Key.

Allocation Length:

This specifies the maximum number of bytes that the initiator has allocated for returned Inquiry data. An Allocation Length of zero indicates that no Inquiry data is transferred. This condition is not considered an error. The drive will terminate the DATA IN phase when Allocation Length bytes have been transferred or when all available Inquiry

data have been transferred to the initiator, whichever is less. INQUIRY will return a CHECK CONDITION status only when the target cannot return the requested Inquiry data. If an INQUIRY is received from an initiator with a pending UNIT ATTENTION condition (before the drive reports CHECK CONDITION status), the target will perform the INQUIRY and will not clear the UNIT ATTENTION condition. CmdDT:

The Command support data (CmdDT) bit of one specifies that the drive returns the optional support data specified

by the operation code field. If both the CmdDT and EVPD bits are zero, the drive returns the standard INQUIRY data. If the page or operation code field is not zero when both CmdDT and EVPD are zero, the drive returns a CHECK CONDITION status with an ILLEGAL REQUEST Sense Key. If the CmdDT and EVPD bits are one, the drive returns a CHECK CONDITION status with an ILLEGAL REQUEST Sense Key. When the EVPD bit is set to one, the drive returns vital product data that is specified in the page or operation code field. If the page or operation code field is reserved or not implemented by the target, the target shall terminate the command with a CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST. When the CmdDT bit is set to one, the page or operation field specifies the SCSI operation code for which the drive shall return support data. EVPD:

The Enable Vital Product Data (EVPD) bit of one specifies that the drive returns the optional vital product data

specified by the page code field.

INQUIRY

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6. COMMAND SPECIFICATION

Vital Product Data

This contains a list of the vital product data codes supported by the drive.

- Supported Vital Product Data pages

Bit76543210

Byte

0 Peripheral Qualifier Peripheral Device Type (01h) 1 Page Code (00h) 2 Reserved (00h) 3 Page Length (03h) 4 Supported Page List (00h) 5 Supported Page List (80h) 6 Supported Page List (83h)

INQUIRY

- Unit Serial Number page

Bit76543210

Byte

0 Peripheral Qualifier Peripheral Device Type (01h) 1 Page Code (80h) 2 Reserved (00h) 3 Page Length (0Ah) 4

The page length field specifies the length of the product serial number. If the allocation length is too small to transfer all of the page, the page length shall not be adjusted to reflect the truncation.

The product serial number field contains ASCII data that is vendor-specific. The least significant ASCII character of the number shall appear as the last byte of a successful data transfer.

Product Serial number (in ASCII)

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6. COMMAND SPECIFICATION

- Device Identification page

Bit76543210

Byte

0 Peripheral Qualifier Peripheral Device Type (01h) 1 Page Code (83h) 2 Reserved (00h) 3 Page Length (26h) 4 Reserved (00h) Code set (02h) 5 Reserved (00h) Identifier type (01h) 6 Reserved (00h) 7 Identifier length (22h)

INQUIRY

8 15 16

Product ID (SDT-10000/SDT-11000)

31 32 41

Command support data

If the drive implements the requested SCSI operation code, it shall return the data defined in table. If the device does not implement the requested SCSI operation code it shall return the peripheral qualifier and type and 001h in the Support field.

Vendor ID (SONY)

Serial Number of the drive

Command support Data

Bit76543210

Byte

0 Peripheral Qualifier Peripheral Device Type (01h)

1 Reserved (00h) Support (03h)

2 ISO version (0) ECMA version (0) ANSI Approved version

6 - 6

3 Reserved (00h)

4 Reserved (00h)

5 CDB size (m-5)

CDB usage data

Support:

The drive supports the tested SCSI operation code in conformance with a SCSI standard. The data format conforms to the definition in table.

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6. COMMAND SPECIFICATION

The drive returns the standard INQUIRY data as described below.

Bit76543210

Byte

0 Peripheral Qualifier Peripheral Device Type (01h) 1 RMB (1) Device-Type Modifier (0) 2 ISO Version (0) ECMA Version (0) ANSI-Approved Version (2) 3 AENC (0) TrmIOP Reserved (0) Response Data Format (2) 4 Allocation Length (1Fh) 5 Reserved 6 Reserved 7 RelAdr (0) WB32 (0) WB16 (0) Sync (1) Linked (0) Reserved CmdQ (0) SftRe (0) 8 (MSB) Vendor Identification

INQUIRY

15 (SONY) (LSB) 16 (MSB) Product Identification 31 (SDT-10000/SDT-11000) (LSB) 32 (MSB) 35 (LSB)

Product Revision Level

Table 6-2: INQUIRY Data

Peripheral Qualifier and Peripheral Device Type:

These fields identify the device that is currently connected to the logical unit. The drive is a single target, single logical unit device. The logical unit number is set to zero. Therefore, the drive normally returns Peripheral Qualifier set to 000b the specified peripheral device type is currently connected to this logical unit and Peripheral Device Type set to 01h sequential-access device. However, if the initiator requests a logical unit number greater than zero, the drive returns Peripheral Qualifier set to 011b the target is not capable of supporting a physical device on this logical unit and Peripheral Device Type set to 1Fh unknown device type.

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6. COMMAND SPECIFICATION

RMB:

The Removable Medium bit is one, indicating that the tape can be removed.

Device-Type Modifier:

This is a seven-bit user defined code, set to 00h.

ISO Version:

This field is zero, indicating that the drive does not necessarily comply with the ISO version of SCSI.

ECMA Version:

This field is zero, indicating that the drive does not necessarily comply with the ECMA version of SCSI.

ANSI Approved Version:

This field is 2, indicating that the drive complies with the ANSI version of SCSI-2.

AENC:

The drive does not support asynchronous event notification, so this field is zero.

TrmIOP:

The drive does not support the Terminate I/O Process message so this field is zero.

Response Data Format:

This field is 2 indicating that the INQUIRY DATA format complies with the ANSI version of SCSI-2.

Additional Length:

The additional length field specifies the length in bytes of the parameters, in this case, 31 bytes.

RelAdr:

The drive does not support the Relative Addressing mode so this bit is never set.

WBus32:

The drive does not support 32-bit wide data transfers, so this bit is never set.

WBus16:

The drive does not support 16-bit wide data transfers, so this bit is never set.

Sync:

The drive supports synchronous data transfers, so this bit is set.

Linked:

The drive does not support linked commands, so this bit is never set.

CmdQue:

The drive does not support tagged command queuing, so this bit is never set.

SftRe:

The drive responds to the RESET condition with a HARD reset, so this bit is never set.

Vendor Identification:

This field contains eight bytes of ASCII data identifying the vendor of the product as “SONY”. This and the next two fields are left-aligned with the unused bytes at the end of the fields and filled with space characters (20h).

Product Identification:

This field contains sixteen bytes of ASCII data identifying the product as “SDT-10000/SDT-11000”.

Product Revision Level:

This field contains four bytes of ASCII data, which define the SCSI Interface Revision Level.

INQUIRY

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6. 03 LOAD/UNLOAD 1Bh

Bit76543210

Byte

0 Operation Code (1Bh) 1 Logical Unit Number Reserved Immed 2 Reserved 3 Reserved 4 Reserved EOT Re-Ten Load 5 Unused (00b) Reserved

LOAD/UNLOAD allows the host to tell the drive to enable or disable the media for further operations.

Load:

When this bit is set, the drive loads the tape and positions it at the beginning of Partition 0. The load command is used when the tape has been retained in the drive by the command sequence, PREVENT ALLOW MEDIA REMOVAL (with prevent bit set), UNLOAD. The drive will automatically perform a Load operation when a tape is inserted, a SCSI Reset is received, or when power is restored with a tape in the drive. If the bit is not set (UNLOAD), the drive writes any buffered data to the tape, writes the EOD, then rewinds the tape to BOM and ejects it.

Immed:

If this bit is set, status is returned as soon as the load or unload operation is initiated. Otherwise, the status is returned after the operation has completed.

Re-Ten:

If this bit is set, the drive winds to EOM then rewinds to BOM before starting a normal loading sequence.

LOAD/UNLOAD

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6. COMMAND SPECIFICATION

EOT:

An end-of-tape (EOT) bit of one and a Load bit of zero indicates that the medium shall be positioned at end-ofmedium for removal from the peripheral device. Prior to performing the unload operation, any buffered data that is to be written shall be transferred to the medium.

An EOT bit of zero and Load bit of zero indicates that the medium shall be positioned at beginning-of-medium for removal etc.

An EOT bit of one and a Load bit of one shall cause the target to return CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST and the additional sense code shall be set to ILLEGAL FIELD IN CDB.

If the drive has received an UNLOAD command with the Immediate bit set and then receives either another command which would involve tape motion or TEST UNIT READY, the drive will return a CHECK CONDITION status with a NOT READY sense key set.

When the drive receives the UNLOAD, it updates the System area of whichever partition on the tape is currently active. The tape is then rewound to BOM and ejected. The operator must reload the drive manually. If, however, the drive has previously received a PREVENT MEDIA REMOVAL (with prevent bit set) command, the tape is retained in the drive. A subsequent LOAD command will load and position the tape at BOP zero. If an UNLOAD were sent instead, the drive would return NOT READY and the tape would remain within the drive. In this case, the drive requires an PREVENT ALLOW MEDIA REMOVAL (with prevent bit clear) command before an UNLOAD will eject the tape.

LOAD/UNLOAD

Note: While the PREVENT MEDIA REMOVAL is in effect, the Front Panel EJECT button is completely disabled.

If the cassette is unloaded but has not been ejected from the drive because of moisture detection, then a subsequent UNLOAD will cause the tape to ejected from the drive. All commands except INQUIRY, REQUEST SENSE and READ BLOCK LIMITS will return a CHECK CONDITION status with a HARDWARE ERROR sense key set. The tape may also be ejected via the Front Panel EJECT button.

If no cassette is in drive, both LOAD and UNLOAD will return a CHECK CONDITION status with NOT READY sense key set.

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6. COMMAND SPECIFICATION

6. 04 LOCATE 2Bh

Bit76543210

Byte

0 Operation Code (2Bh)

1 Logical Unit Number Reserved BT (0) CP Immed 2 Reserved 3 (MSB) 4 Block Address 5 6 (LSB) 7 Reserved 8 Partition

LOCATE

9 Unused (00b) Reserved

LOCATE command causes the target to position the logical unit to the specified block address in a specified partition. Upon completion, the logical position shall be before the specified location. Prior to performing the locate operation, the target shall ensure that all buffered data, filemarks, and setmarks have been transferred to the medium. BT: A block address type (BT) bit=1 is not supported and shall be set to zero otherwise a CHECK CONDITION with

an ILLEGAL REQUEST sense key will be returned.

CP: A change partition (CP) bit of one indicates that a change to the partition specified in the partition field is to occur

prior to positioning to the block specified in the block address field. A CP bit of zero indicates no partition change is to be made and the partition field is to be ignored.

Immed:

An immediate (Immed) bit of zero indicates that the target shall not return status until the locate operation has completed. An Immed bit of one indicates that the target shall return status as soon as all buffered commands have completed execution and the command descriptor block of the LOCATE command has been validated. If CHECK CONDITION status is returned for a LOCATE command with an Immed bit of one, the locate operation shall not be performed.

Block Address:

The Block Address field specifies the block address to which the target shall position the medium based on the current setting of the BT bit.

Partition:

The Partition field specifies which partition to select if the CP bit is one. Refer to the MODE SELECT command, Medium Partition page for additional information about partitioning.

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6. COMMAND SPECIFICATION

6. 05 LOG SELECT 4Ch

Bit76543210

Byte

0 Operation Code (4Ch)

1 Logical Unit Number Reserved PCR SP (0)

2 PC Reserved

3 Reserved

4 Reserved

5 Reserved

6 Reserved

7 (MSB)

8 (LSB)

LOG SELECT

Parameter List Length

9 Unused (00b) Reserved

The LOG SELECT command provides a means for the Host to manage statistical information maintained by the device about its own hardware or the installed media. This description should be read in conjunction with the description of the LOG SENSE command which follows it, to provide the reader with information about log page format, parameters and supported pages.

PCR:

A Parameter Code Reset bit of one and a Parameter List Length of zero will cause ALL log pages which can be cleared, to be cleared. If this field is set and the Parameter List Length field is non-zero then the command will be terminated with a CHECK CONDITION status with the sense key set to ILLEGAL REQUEST, and an additional sense code of INVALID FIELD IN CDB.

SP: The device does not have non-volatile RAM into which it may save parameters. Therefore, the Save Page bit is not

supported by this device and shall always be set to zero. If the SP bits is set, the command will be terminated with CHECK CONDITION status with the sense key set to ILLEGAL REQUEST, and an additional sense code of INVALID FIELD IN CDB.

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6. COMMAND SPECIFICATION

PC: The Page Control field defines the type of parameter values to be selected:

Value Type of Parameter Values 00b Current Threshold Values

01b Current Cumulative Values 10b Default Threshold Values 11b Default Cumulative Values

LOG SELECT

Table 6-3: Page Control field values

If this field is set to 00b, 10b or 11b and the Parameter List Length field is non-0 then the command will be terminated with a CHECK CONDITION status with the sense key set to ILLEGAL REQUEST, and an additional sense code of INVALID FIELD IN CDB. This is because no modification of these log pages are permitted.

For a description of command action if this field is set to 01b then see the description of the Parameter List Length field below.

If this field is set to 10b and the Parameter List length field is 0 then all Current Threshold Values will be reset to the Default Threshold Values. This equivalent to no change as Threshold Values cannot be modified.

If this field is set to 11b and the Parameter List Length field is 0 then all Current Cumulative Values will be reset to the Default Cumulative Values.

This is equivalent to all log pages which can be cleared.

Parameter List Length: This field specifies the length in bytes of the LOG SELECT parameter list that shall be transferred from the initiator to the target during the DATA OUT phase. A parameter list length of zero indicates that no data shall be transferred. This condition shall not be considered as an error (see description of Parameter Code Reset and Page Control fields above). If this field is non-0 the Page Control field must be 01b.

The purpose of the LOG SELECT command is to allow the initiator to modify and initialize parameters within the logs supported by the device. However in this case, access to individual parameters within log pages is not supported and so initiator is restricted to resetting complete log pages only.

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6. COMMAND SPECIFICATION

To achieve this, during the DATA OUT phase the initiator must send the log page header of the page to be cleared, with the Page Length field set to 0. The following pages can be cleared in this manner.

Note: Due to the way in which logs are stored and updated, clearing log page 2 will

result in log page 3 also being cleared and vice versa. Because of this method of clearing the log pages, the Parameter List Length field must be an integer multiple of the Log Page Header length (i.e. 4). Otherwise the command will be terminated with a CHECK CONDITION status with the sense key set to ILLEGAL REQUEST and an additional sense code of INVALID FIELD IN CDB. If multiple pages are sent during this DATA OUT phase then they must be sent in ascending order according to page code. Otherwise the command will terminate with a CHECK CONDITION status with the sense key set to ILLEGAL REQUEST and an additional sense code of ILLEGAL FIELD IN PARAMETER LIST. The same status will be returned if an unsupported Page Code appears in any header or if the specified page cannot cleared.

LOG SELECT

Page Code Description

02h Write Error Counter Page 03h Read Error Counter Page 07h Last n Error Events Page

Table 6-4: Page Codes

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6. COMMAND SPECIFICATION

6. 06 LOG SENSE 4Dh

Bit76543210

Byte

0 Operation Code (4Dh) 1 Logical Unit Number Reserved PPC (0) SP (0) 2 PC Page Code 3 Reserved 4 Reserved

LOG SENSE

5 (MSB) 6 (LSB) 7 (MSB) 8 (LSB) 9 Unused (00b) Reserved

LOG SENSE provides a means for the Host to retrieve statistical information maintained by the device about its own hardware or the installed media. It is a complementary command to the LOG SELECT command.

SP: The device does not have non-volatile RAM into which it may save parameters. Therefore, the Save Page bit is not

supported by this device and shall always be sent to zero. If the SP bit is set, the command will be terminated with CHECK CONDITION status with the sense key set to ILLEGAL REQUEST, and an additional sense code of INVALID FIELD IN CDB.

Parameter Pointer

Allocation Length

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6. COMMAND SPECIFICATION

PPC:

The Parameter Pointer Control bit shall always be set to zero. This indicates that the parameter data requested from the device will start with the parameter code specified in the Parameter Pointer field and return the number of bytes specified in the Allocation Length field in ascending order of parameter codes from the specified log page. A PPC bit of zero and a Parameter Pointer field of zero cause all available parameter data for that page code to be returned to the initiator. If the PPC bit is set or the Parameter Pointer is larger than the highest numbered parameter on the page, then the target shall terminate the command with CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST and the additional sense code shall be set to INVALID FIELD IN CDB.

If the drive does not support a parameter code within this page then it shall not return any data associated with this

parameter.

PC: The Page Control field defines the type of parameter values to be selected. The page control field is defined below:

LOG SENSE

Value

00b 01b 10b 11b

Type of Parameter Values

Current Threshold Values Current Cumulative Values Default Threshold Values Default Cumulative Values

Table 6-5: Page Control field values

The Current Threshold Values and the Default Threshold Values are non-changeable and will both return the same values - i.e. the maximum values that each parameter can attain. Note that for some parameters the term threshold value has no meaning. See the description of individual pages/parameters below for more details. The Current Cumulative Values are the values computed since the last reset of the device (either by power-cycling, BUS DEVICE RESET or SCSI RESET). Note that for some parameters these values cannot be reset by any method. See description of individual pages/parameters below for more details. The Default Cumulative Values are the values to which each parameter gets initialized on a reset condition as described above. See description of individual pages/parameters below for more details.

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6. COMMAND SPECIFICATION

Page Code:

The Page Code field identifies which log page is being requested by the initiator. If the page is not supported then the command will terminate with a CHECK CONDITION status with the sense key set to ILLEGAL REQUEST and an additional sense code of INVALID FIELD IN CDB. Supported pages are:

Page Code Description Allocation Length

00h Supported Log Pages 0Ch 02h Write Error Counter Page 20h 03h Read Error Counter Page 20h 07h Last n Error Events Page 30h Tape Log Page (Sony Unique)

31h Tape Capacity Log Page 24h 33h Drive Usage Page (Sony Unique) 39h Data Compression Transfer Log Page 5Ch

1A8h (max)

5Ch

5Eh (DDS-3 and DDS-4)

154h

LOG SENSE

Table 6-6: Supported Log Pages

Parameter Pointer:

The Parameter Pointer field allows the host to specify at which parameter within a log page the requested data should begin. For example if a page supported parameters 0 through 5, and the Parameter Pointer field contained 3 then only parameters 3, 4 and 5 would be returned to the initiator. Similarly, if a page supported parameters 1, 3 and 6, and the Parameter Pointer field contained 2, then only parameters 3 and 6 would be returned to the initiator. Note that parameters within a page are always returned in ascending order according to parameter code. If an invalid parameter pointer is sent the drive will return CHECK CONDITION with the sense key set to ILLEGAL REQUEST and an additional sense code of INVALID FIELD IN CDB.

Allocation Length:

The Allocation Length field is used to inform the target how much space the initiator has allocated for data. There must be sufficient space allocated for all the requested data. If there isn’t then the command will terminate with a CHECK CONDITION status with the sense key set to ILLEGAL REQUEST and an additional sense code of INVALID FIELD IN CDB. Note however that if this field is 0 then this is not considered an error and the device will just return a GOOD status.

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6. COMMAND SPECIFICATION

6. 06. 1 The Log Page Descriptor

The format of the log pages consists of zero or more variable-length parameter structures. Each page begins with a 4byte page header followed by zero or more variable-length parameter structures defined for that page. The Log Select command supports the ability to send zero or more log pages. The LOG SENSE command returns a single log page as specified in the Page Code field of the CDB.

Bit76543210

Byte

0 Reserved Page Code 1 Reserved

LOG SENSE

2 (MSB) 3 (LSB)

4- Log Parameter (First)

x+3 (Length x)

n-y Log Parameter (Last)

n (Length y)

Page Length (n-3)

Log Parameters (s)

•

Table 6-7: Log Page Format

Page code:

Identifies which page of data is being transferred. If the Page Code field value is reserved or not implemented by the target, the target shall terminate the command with a CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST, and the additional sense code shall be set to INVALID FIELD IN PARAMETER LIST.

6 - 18

Page Length:

Defines the length, in bytes, of the following log parameters. This length does not include bytes zero through three. A Page Length value that results in the truncation of any parameter shall cause the target to terminate the command with CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST and the additional sense code shall be set to INVALID FIELD IN PARAMETER LIST.

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6. COMMAND SPECIFICATION

6. 06. 2 The Log Parameter Descriptor

Most log pages contain one or more special data structures called log parameters. These may be data counters which record the occurrence of certain events, or they may be more complex structures which describe activities or other events which occur within the device. Each parameter structure begins with a 4-byte parameter header followed by one or more bytes of parameter structure data. The 4-byte header is shown below:

Bit76543210

Byte

0 (MSB) Parameter Code 1 (LSB) 2 DU DS (1) TSD ETC TMC Reserved LP 3 Parameter Length (n-3)

LOG SENSE

4 n

Parameter Value

Table 6-8: Log Parameter

Parameter Code:

Identifies which parameter of data is being transferred. If the parameter code value is reserved or not implemented by the target, then the target shall terminate the command with CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST and the additional sense code shall be set to INVALID FIELD IN PARAMETER LIST. The DU, DS, TSD, ET, TMC, and LP fields are collectively referred to as the control byte.

DU: The DU bit (Disable Update) is not defined for threshold values (indicated by the PC field of the LOG SENSE

command descriptor block). The target shall ignore the value of any DU bits in a LOG SELECT command.

DS: The DS bit-field informs the initiator that savable parameters are disabled (i. e. not supported), and should always

be 1. If it is 0 the command will terminate with CHECK CONDITION status with sense key set to ILLEGAL REQUEST and additional sense code of ILLEGAL FIELD IN PARAMETER LIST.

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6. COMMAND SPECIFICATION

TSD:

A target save disable (TSD) bit of zero indicates a target-defined method for saving log parameters. This implicit saving operation shall be done frequently enough to insure that the cumulative parameter values retain statistical significance (i.e. across power cycles). A TSD bit of one indicates that either the target does not provide a targetdefined method for saving log parameters or the target-defined method has been disabled by the initiator. If the initiator sets both the DS and the TSD bits set to one, the target shall terminate the command with CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST with the additional sense code set to INVALID FIELD IN PARAMETER LIST.

ETC:

This bit is not supported by this device. An enable threshold comparison (ETC) bit of one indicates that when the cumulative parameter value is updated, it shall be compared to the threshold parameter value and the action specified by the TMC field shall be taken. An (ET) bit of zero disables this comparison. The ET bit is the same for both the cumulative and threshold log parameter. Thus when the ET bit is set to a value by the initiator, this value is returned for both the cumulative and threshold values of the log parameter.

LOG SENSE

TMC:

This bit is not supported by this device. The threshold met criteria (TMC) field defines the binary relationship between the cumulative and threshold log parameter values under which the threshold is met. If the ET bit is one and the threshold condition is met, a Unit Attention condition shall be posted to all initiators. When reporting the unit attention condition, the target shall set the sense key to UNIT ATTENTION, the additional sense code to LOG EXCEPTION, and the additional sense code qualifier to THRESHOLD CONDITION MET.

TMC

00b 01b 10b 11b

Threshold Met Criteria

Any update of the parameter Cumulative = Threshold Cumulative < > Threshold Cumulative > Threshold

Table 6-9: Threshold Met criteria

The TMC field is the same for both the cumulative and threshold parameter. Thus when the TMC field is set to a value by the initiator, this value is returned for both cumulative and threshold values of the log parameter.

LP: The LP bit field defines whether the parameter is a data counter or a list parameter. An LP bit of one indicates that

the parameter is a list Parameter. An LP bit of Zero indicates that the parameter is a data counter. See the description of each supported page below for information on the setting of this field.

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Note: If any of the other bit-fields in the control byte are set then the command will terminate with a CHECK CONDI-

TION status with a sense key of ILLEGAL REQUEST and an additional sense code of INVALID FIELD IN

PARAMETER LIST.

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6. 06. 3 Supported Log Pages

The following log pages are supported:

Page Code Description Allocation Length

00h Supported Log Pages 0Ch 02h Write Error Counter Page 20h 03h Read Error Counter Page 20h 07h Last n Error Events Page 30h Tape Log Page (Sony Unique) 5Ch

31h Tape Capacity Log Page 24h 33h Drive Usage Page (Sony Unique) 39h Data Compression Transfer Log Page 5Ch

Table 6-10: Supported Log pages

A description of each supported log page is given below.

LOG SENSE

1A8h (max)

5Eh (DDS-3 and DDS-4)

154h

6. 06. 3. 1 Summary List of Supported Pages

The summary list of supported log pages returns the list of page codes supported by the target. This page is only valid for the Log Sense command and if sent to the host during a Log Select command will cause termination with CHECK CONDITION status with sense key set to ILLEGAL REQUEST and additional sense code of INVALID FIELD IN PARAMETER LIST.

Bit76543210

Byte

0 Page Code (00h) 1 Reserved 2 (MSB) 3 4 Supported Page List

C (00 02 03 07 2E 30 31 33 39h)

Page Length (00 08h)

(LSB)

Table 6-11: Supported Log Pages

This page returns the summary list of supported log pages for the specified logical unit to the requesting initiator.

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IMPLEMENTORS NOTE: Typically, an initiator should first request page zero to determine the list of pages supported by the device. The page code parameters are a list containing the page codes of the supported pages for the logical unit in ascending order. Note that neither Threshold nor Cumulative values have any meaning for this page.

6. 06. 4 Write and Read Error Counters Pages

The Error Counters Pages (Write and Read) are used to report statistical information about Write and Read soft and hard errors and retries. Each parameter is a counter which is updated by the target every time the corresponding event occurs. The format of the Error Counters Pages is given below:

Bit76543210

Byte

0 Page Code (02h or 03h) 1 Reserved

LOG SENSE

2 (MSB) 3 (LSB) 4 (MSB) 5 (LSB) 6 DU (0) DS (1) TSD (0) ETC (0) TMC (00) Reserved LP (0) 7 Parameter Length (m) 8 (MSB) n (LSB)

Page Length (n)

Parameter Code

Parameter Value

Table 6-12: Write/Read Error counters page

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The Page Code is one of the following:

LOG SENSE

Page Code

02h 03h

Description

Write Error Counter Page Read Error Counter Page

Table 6-13: Page Code

The following parameter codes are supported for each Error Counters Page:

Parameter Description Parameter Default Default

Code Length (Bytes) Cumulative Threshold

0003h Total Errors Corrected 2 0 FFFFh

(Soft Errors)

0004h Total T imes Correction 4 0 FFFFFFFFh

Algorithm Processed

0005h Total Groups Processed

0006h Total Errors Uncorrected

(Hard Errors)

2 0 FFFFh

0 FFFFFFFFh

Table 6-14: Error Counter parameter codes

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6. 06. 5 Last N Error Events List

This page is used to report information on soft and hard errors encountered by the device during normal operation. Each parameter corresponds to an encountered error and is a report of what type of error occurred and when it occurred. The format of the page is given below:

Bit76543210

Byte

0 Page Code (07h) 1 Reserved

LOG SENSE

2 (MSB) 3 (LSB) 4 (MSB) 5 (LSB) 6 DU (0) DS (1) TSD (0) ETC (0) TMC (00) Reserved LP (1) 7 Parameter Length (0Ah) 8

Page Length (n*14)

Parameter Code

Parameter Value

Table 6-15: Last N Error Events Page

The Parameter Codes supported are 1 through 30 where 30 is the maximum number of entries in the log page.

If there are no entries, the command will return the Page Header with the Page Length field set to 0.

Each error event record contains diagnostic information for a single error encountered by the device. The parameter codes associated with the error-event records indicate the order in which the errors occurred. A higher parameter code indicates that the error event occurred later in time.

6 - 24

Each parameter entry is 10 bytes long and has the following format:

Byte Offset

0 - 4

6 - 9

Meaning

Result Message (see Diagnostic Section) Unused Timestamp (number of 50 ms increments since power-on)

Table 6-16: Error Event format

When the log page becomes full, no more entries will be added until the log is cleared (using one of the methods described previously) or a reset occurs. The current cumulative values will be returned regardless of the page control field in the LOG SENSE CDB.

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6. 06. 6 Tape Log Page (Sony Unique)

This page is a Sony unique page which provides information on the tape currently being used. This log cannot be cleared and has the following format:

Bit76543210

Byte

0 Page Code (30h) 1 Reserved 2 (MSB) Page Length (58h) 3 Page Length (5Ah) (DDS-3 and DDS-4) (LSB)

LOG SENSE

4 (MSB) 5 (LSB) 6 DU (0) DS (1) TSD (0) ETC (0) TMC (00) Reserved LP (0) 7 Parameter Length (m) 8

3+m

Parameter Code

Parameter Value

Table 6-17: Tape Log Page

This page is used to return Tape Log information to the host in a format which conforms to the LOG SENSE command page format.

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6. COMMAND SPECIFICATION

Supported Parameter Codes in this page are listed below along their meanings:

Parameter Code Description Length

001h Current number of Groups Written 3 002h Current number of RAW Retries 2 003h Current number of Groups Read 3 004h Current number of ECC-3 Retries 2

005h Previous number of Groups Written 3

006h Previous number of RAW Retries 2 007h Previous number of Groups Read 3

008h Previous number of ECC-3 Retries 2

009h Total number of Groups Written 4

00Ah Total number of RAW Retries 3

00Bh Total number of Groups Read 4 00Ch Total number of ECC-3 Retries 3

LOG SENSE

4 (DDS-3 and DDS-4)

00Dh Load Count 2

Table 6-18: Tape Log parameter codes

This information is contained within RAM in the Drive Controller. When a cassette is loaded, the contents of the System Area are copied into this log. The log is updated as the tape is used and is copied back onto the System Area when the cassette is unloaded (if the tape is Write enabled). Note: The System Area only contains ‘previous’ and ‘total’ information - (when the cassette is unloaded, the ‘current’

values become the System Area ‘previous’ values). The term ‘current’ refers to information generated during the current load of the tape; ‘previous’ refers to information generated during the last tape load; ‘total’ refers to information generated during the life of the tape since it was first initialized including the current load. Use: An estimate of reading and writing performance can be made by the ratios of ‘RAW retries’ to ‘groups written’

and ‘ECC-3 retries’ to ‘groups read’. An indication of tape degradation can be gained by comparing these ratios

for ‘current’, ‘previous’ and ‘total’ entries.

Any attempt to change this page using LOG SELECT will result in a CHECK CONDITION with a Sense Key of ILLEGAL REQUEST. The current cumulative values will be returned regardless of the Page Control field in the LOG SENSE CDB.

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6. 06. 7 Tape Capacity Log Page

The Tape Capacity Log Page is used to indicate the approximate capacity of the tape currently being used. The PC field of the LOG SENSE command is ignored for this field. The 36 bytes of the log page have the following format:

Bit76543210

Byte

0 Page Code (31h) 1 Reserved

LOG SENSE

2 (MSB) 3 (LSB) 4 (MSB) 5 (LSB) 6 DU (0) DS (1) TSD (0) ETC (0) TMC (11) Reserved LP (0) 7 Parameter Length (04h) 8 (MSB)

11 (LSB)

Page Length (20h)

Parameter Code

Parameter Value

Table 6-19: Tape Capacity Log Page

Tape Capacity Log Page Parameters:

Code Value 0001 Remaining capacity, partition 0 (kilobytes)

0002 Remaining capacity, partition 1 (kilobytes), For a single partition tape, it will be zero. 0003 Maximum capacity , partition 0 (kilobytes) 0004 Maximum capacity, partition 1 (kilobytes). For a single partition tape, it will be zero.

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6. 06. 8 Drive Usage Log Page (Sony Unique)

This page is a SONY unique page which provides information on the drive currently being used. This log cannot be cleared and has the following format:

Bit76543210

Byte

0 Page Code (33h) 1 Reserved

LOG SENSE

2 (MSB) 3 (LSB) 4 (MSB) 5 (LSB) 6 DU (0) DS (1) TSD (0) ETC (0) TMC (00) Reserved LP (0) 7 Parameter Length (m) 8

7+m

Page Length (150h)

Parameter Code

Parameter Value

Table 6-20: Drive Usage Log Page

This page is used to return the vendor unique Drive Usage Log information to the host in a format which conforms to the Log Sense command page format.

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6. COMMAND SPECIFICATION

Supported Parameter Codes in this page are listed below with their meaning:

Parameter Code Length (bytes)

0001h Drum revolution minute 3 0002h Load count 3 0003h Thread count 3 0004h Assert count 3 0005h Cleaning interval (minute) 3 0006h Power on time 3 0007h MD serial number 4 0008h PCB serial number 4 0009h Drive serial number 4 0011h - 2Eh Last 30 Mechanism Error Events List 5 x 30

Table 6-21: Supported Parameter Codes

LOG SENSE

Each Mechanism Error Event is 5 bytes long and has following format:

Byte offset Meaning

0 Error code 1 Executing Mechanism Commands when error was detected 2 - 4 Timestamp (minute)

Table 6-22: Mechanism Error Event Format

Executing Mechanism Commands

FWD ATF ON FF PAUSE THREAD TENSION OFF RVS REW UNTHREAD STOP EJECT MD INITIALIZE

0x01 0x07 0x0e 0x0f 0x10 0x11 0x17 0x20 0x21 0x22 0x2A

FWD LOAD RE TENSION RESTART STOP FF STOP REW ASSERT RELEASE RE ASSERT STOP FWD STOP RVS

0x30 0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3A

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6. 06. 9 Data Compression Transfer Log Page

The page allows the host to monitor the performance of the DCLZ compression. The PC field in LOG SENSE determines whether current cumulative, default cumulative, or current/default threshold values are returned. The page has the following format:

Bit76543210

Byte

0 Page Code (39h) 1 Reserved

LOG SENSE

2 (MSB) 3 (LSB) 4 (MSB) 5 (LSB) 6 DU (0) DS (1) TSD (0) ETC (0) TMC (00) Reserved LP (0) 7 Parameter Length (04h) 8 (MSB)

11 (LSB)

Page Length (58h)

Parameter Code (n)

Parameter Value

Table 6-23: Data Compression Transfer Log Page

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Data Compression Log Page Fields: Supported Parameter Codes in this page and their meanings are as follows:

Code Description

0001h Number of entities written 0002h Number of entities read 0003h Number of records written 0004h Number of records read 0005h Kilobytes to data compression 0006h Kilobytes from data compression 0007h Kilobytes to tape 0008h Kilobytes from tape 0009h Logical entity size 000Ah Physical entity size 000Bh Uncompressed entities

Entities Written/Read:

The total number of complete entities written to or read from the tape since the last power-on or Cleaner Log operation.

Records Written/Read:

The total number of records (both compressed and uncompressed) written to or read from the tape since the last power-on or Clear Log operation.

Kilobytes to/from Data Compression:

The total number of kilobytes written to or read from the tape since the last power-on or Clear Log operation. For Kilobytes from Data Compression, this number may be greater than the number of kilobytes transferred to the host due to readahead.

Logical Entity Size:

The logical size of the last entity written to or read from the tape:

size = number of records in entity x record size in bytes

Physical Entity Size:

The physical size of the last entity written to or read from the tape:

size = entity header length + uncompressed data length

Uncompressed Entities:

The total number of times non-DCLZ entities have been encountered on the tape during read operations since the last power-on or Clear Log operation.

LOG SENSE

LOG SENSE Commands

From these figures, the host can calculate the average compression ratio achieved by the drive since the last power-on or Clear Log operation as follows:

average compression ratio =

Similarly, the host can calculate instantaneous compression ratio achieved by the drive for a particular read or write command:

instantaneous compression ratio =

kilobytes to data compression kilobytes to tape

logical entity size physical entity size

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6. COMMAND SPECIFICATION

6. 07 MODE SELECT 15h

Bit76543210

Byte

0 Operation Code (15h) 1 Logical Unit Number PF Reserved SP (0) 2 Reserved 3 Reserved 4 Parameter List Length 5 Unused (00b) Reserved

MODE SELECT enables the Host to configure the drive. Similarly MODE SENSE enables the Host to identify which configuration parameters the drive supports and what its current configuration actually is. Implementing MODE SELECT and MODE SENSE requires a certain amount of “handshaking” between the Host and the drive. Before configuring the drive, the Host should issue a MODE SENSE. This allows the drive to return its current configuration and indicate what parameters are configurable. The Host interprets this information and may then issue a MODE SELECT command to set up the drive to the Host’s preferred configuration. Note: In the MODE SELECT and MODE SENSE (opcode 1Ah) descriptions much of the information overlaps and

therefore the two descriptions should be read in conjunction. MODE SELECT allows the initiator to specify configuration parameters to the drive. The drive always powers-up with its default configurations set. This is also true if the drive receives a BUS DEVICE RESET message or a hard reset through the RST line on the SCSI bus. PF: The Page Format bit indicates that the data sent by the Host after the MODE SELECT header and block descriptors

complies with the definition of pages as set out in SCSI-2. The drive expects this bit to be set, otherwise it returns a CHECK CONDITION status with the sense key set to ILLEGAL REQUEST. However, if the Parameter List Length is set to 12 bytes, i.e. the host only wishes to transfer the Parameter List Header and a single Block Descriptor, the PF bit need not be set and the drive will return a GOOD status.

SP: The Save Parameters bit instructs the drive to save all savable pages. This bit is not supported and the drive will

return a CHECK CONDITION status with an ILLEGAL REQUEST sense key set if it is set.

Parameter List Length:

This specifies the length, in bytes, of the MODE SELECT parameter list that is transferred during the DATA OUT phase. A zero parameter list length indicates that no data is transferred. The Parameter List length must be a value which coincides with header, block descriptor or page boundaries. If this does not occur then the drive will return a CHECK CONDITION status with an ILLEGAL REQUEST sense key set.

MODE SELECT

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6. COMMAND SPECIFICATION

The MODE SELECT parameter list shown below, contains a four-byte header, followed by one eight-byte block descriptor.

Bit76543210

Byte

0 Reserved 1 Reserved 2 Reserved Buffered Mode Speed (00h) 3 Block Descriptor Length (08h) 4 Density Code 5 (MSB) 6 Number of Blocks (00 00 00h) 7 (LSB)

MODE SELECT

8 Reserved

9 (MSB) 10 Block Length 11 (LSB)

Table 6-24: MODE SELECT parameter list

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Buffered Mode:

Buffered Mode is the mechanism by which the drive implements Immediate Reporting on WRITE commands. If the field is zero, then the drive does not report a GOOD status on WRITE commands until the data blocks are actually written to tape. If the Buffered Mode field is one, then the drive reports GOOD status on WRITE commands as soon as the data block has been transferred to the buffer. This is the default configuration for the drive. If Buffered Mode is not used, the drive will suffer a significant degradation in performance with respect to capacity as each record will be written as a partial group. Partial groups are not appended to automatically, but are left on the tape.

Speed:

The drive only supports one speed, the default speed. Because of this, this field must be set to zero. Any other value will cause a CHECK CONDITION status with an IL LEGAL REQUEST sense key is returned.

Block Descriptor Length:

This specifies the length in bytes of all the block descriptors. Since the drive only allows one block descriptor, this value must be eight. Any other value will cause a CHECK CONDITION status with an ILLEGAL REQUEST sense key to be returned.

Note: The block descriptor specifies the media characteristics for the DDS drive. The block descriptor contains the

density code, number of blocks and block length fields.

Density Code:

The supported values for the density code field are defined in the following table.

MODE SELECT

Code Value Density

00h Default Format 13h Sony/Hewlett Packard DDS1 Format 24h Sony/Hewlett Packard DDS2 Format 25h Sony/Hewlett Packard DDS3 Format 26h Sony/Hewlett Packard DDS4 Format 7Fh No change from previous density (No-Op)

Table 6-25: Sequential-Access Density Codes

Note: 00h - Default: The use of the word “Default” is SCSI specific. It instructs the drive to use its default or only

density. Therefore the drive uses its only density of 13h. 13h is the value that has been allocated for use by DDS devices by the ANSI SCSI Committee (X3T9.2).

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Number of Blocks:

A MODE SENSE field which will be returned as zero, indicating that all of the remaining logical blocks on the media will have the medium characteristics specified by the block descriptor, or until a subsequent MODE SELECT command changes those parameters. This field must be set to zero on a MODE SELECT otherwise a CHECK CONDITION status will be returned with an ILLEGAL REQUEST sense key.

Block length:

The Block Length field specifies the length in bytes of each logical block transferred over the SCSI bus. A block length of zero indicates that the length is variable. Any other value indicates the number of bytes per block that the drive must handshake over the bus. This establishes block length such that the transfer length for read, write and verify type commands will be a block count not a byte count.

Note: It is value of this field together with the Fixed Bit Field in the READ, or WRITE commands that determines

whether the drive is in Fixed or Variable block mode.

Mode Fixed Bit in Read, Write, Block Length in

Verify & Recover Buffered Data Mode Select/Sense

Fixed Block 1 Block Size

Variable Block 0 0

MODE SELECT

The default fixed block size is 512 bytes however, the drive will accept a variable Write command (fixed bit of zero) without reporting an error.

Following the Block Descriptor are the MODE SELECT pages. They are the method by which the device parameters are set. Each page has a two byte header which identifies the page code and indicates the number of bytes in that page.

Bit76543210

Byte

0 PS Reserved Page Code 1 Additional Page Length

Table 6-26: MODE SELECT Page Header

PS: when the Page Savable bit is set, this indicates that the page contains saved parameters. This bit will never be set as

there is no non-volatile RAM on the drive into which parameter data may be saved. The page codes that are supported are:

Page Code Description Parameter List Length

00h Standard Sense 0Ch 02h Disconnect-Reconnect Page 0Ch+10h=1Ch 0Fh Data Compression Control Page 0Ch+10h=1Ch 10h Device Configuration Page 0Ch+10h=1Ch 11h Medium Partitions Parameter Page 0Ch+0Ch=18h 1Ch Information Exception Control 0Ch+0Ch=18h 3Fh Return All Pages 0Ch+10h+10h+10h+0Ch=48h

Table 6-27: Supported MODE SELECT Page Codes

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Additional Page Length:

Indicates the number of bytes in that page. The value does not, however, include bytes 0 and 1. The length is returned on MODE SENSE and must subsequently be set to the same value when performing MODE SELECT. If the page length does not match that expected by the drive a CHECK CONDITION status is returned with the sense key to set to ILLEGAL REQUEST. The drive also returns a CHECK CONDITION status with an ILLEGAL REQUEST sense key if the Host sends an unsupported Page Code, a page field with values that are not supported or are not changeable. In this case, no parameters will have been changed by the command.

MODE SELECT

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6. COMMAND SPECIFICATION

Informational Exceptions Control Page (1Ch)

The Informational Exceptions control page defines the methods used by the target to control the reporting and the operations of specific informational exception conditions.

MODE SELECT

Informational Exceptions Control Page

Bit76543210

Byte

0 PS (0) Reserved Page Code (0 × 1Ch)

1 Page Length (0Ah)

2 Perf (0) Reserved (0) Dexcpt (1) Test (0) Reserved LogErr (0)

3 Reserved MRIE

4 (MSB)

8 (MSB) 11

LogErr:

Log Error bit (LogErr) of ZERO indicates that the logging of informational exception conditions by a drive is vendor-specific. This bit of one indicates the drive shall log informational exception conditions.

Dexcpt:

The Disable Exception Control (Dexcpt) bit of ZERO indicates information operations shall be enabled. The reporting of information exception conditions when the Dexcpt bit is set to ZERO is determined from the method of reporting informational exception field. The Dexcpt bit of ONE indicates the drive shall be disable all information exception operations. The method of reporting informational exceptions field is ignored when Dexcpt is set to ONE.

Test:

This field is not supported. If this bit is set a CHECK CONDITION status is retuned with an ILLEGAL REQUEST sense key.

Perf:

The performance bit (Per) of ZERO indicates that informational exception operations that are the cause of delays are acceptable. The Perf bit of ONE indicates the drive shall be set to ZERO otherwise a CHECK CONDITION with an ILLEGAL REQUEST sense key set.

MRIE:

The Method of Reporting Informational Exceptions field (MRIE) is not used by SDT-10000/SDT-11000 and shall be set to ZERO otherwise a CHECK CONDITION with an ILLEGAL REQUEST sense key set.

Interval Timer:

This field is not supported by the drive and if set a CHECK CONDITION status is returned with an ILLEGAL REQUEST sense key set.

Report Count:

This field is not supported by the drive and if set a CHECK CONDITION status is retuned with an ILLEGAL REQUEST sense key set.

Interval Timer (00 00 00 00h)

Report Count

(00 00 00 00h)

(LSB)

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6. COMMAND SPECIFICATION

6. 07. 1 Disconnect-Reconnect Page

The drive supports the Disconnect-Reconnect Page which has the following format:

Bit76543210

Byte

0 PS (0) Reserved Page Code (02h) 1 Page Length (0Eh) 2 Buffer Full Ratio (00h) 3 Buffer Empty Ratio (00h) 4 (MSB) 5 (LSB) 6 (MSB) 7 (LSB)

MODE SELECT

Bus Inactivity Limit (00h)

Disconnect Time Limit

8 (MSB)

9 (LSB) 10 (MSB) 11 (LSB) 12 Reserved DTDC 13 Reserved 14 Reserved 15 Reserved

Connect Time Limit (00h)

Maximum Burst size

Table 6-28: Disconnect-Reconnect Page

Buffer Full Ratio, Buffer Empty Ratio, Bus Inactivity Limit and Connect Time Limit fields are not supported by the drive if set to non-zero values a CHECK CONDITION status is returned with ILLEGAL REQUEST sense key set.

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6. COMMAND SPECIFICATION

Disconnect Time Limit:

This field indicates the minimum time in 100 microsecond increments that the drive shall wait after releasing the SCSI bus before attempting reselection.

Maximum Burst Size:

This field defines the maximum amount of data that the drive shall transfer during a data phase before disconnecting. This value is expressed in increments of 512 bytes. Default value= 255 (0FFCh).

Note: 512 * 494 = 252,928 bytes which means that the Maximum Burst Size is approximately equal to two DDS Format

Groups of user data. DTDC: This field defines further restrictions on when a disconnect is permitted.

DTDC Description 00b Data transfer disconnect control is not used. Disconnect is controlled by the other field in this page.

01b A target shall not attempt to disconnect once the data transfer of a command has started until all data the

command is to transfer has been transferred. The connect time limit and bus inactivity limit are ignored

during the data transfer. 10b Reserved 11b A target shall not attempt to disconnect once the data transfer of a command has started until the com-

mand is complete. The connect time limit and bus inactivity limit are ignored once data transfer has

started.

MODE SELECT

If DTDC is nonzero and the maximum burst size is nonzero the target shall return CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST and the additional sense code set to ILLEGAL FIELD IN PARAMETER LIST.

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6. COMMAND SPECIFICATION

6. 07. 2 Data Compression Control Page

The drive supports the Data Compression Control Page which has the following format:

Bit76543210

Byte

0 PS (0) Reserved Page Code (0Fh) 1 Page Length (0Eh) 2 DCE DCC Reserved 3 DDE RED Reserved 4 (MSB) 7 (LSB) 8 (MSB)

11 (LSB)

MODE SELECT

Compression Algorithm

Decompression Algorithm

12 Reserved 13 Reserved 14 Reserved 15 Reserved

Table 6-29: Data Compression Control Page

This page specifies the parameters for the control of the data compression capability of the drive. DCE:

A data compression enable (DCE) bit of one indicates that data compression is enabled. When this bit is set, data sent to the device by the initiator shall be processed using the selected compression algorithm before being written to the medium. A DCE bit of zero indicates that data compression is disabled.

DCC:

A data compression capable (DCC) bit of one indicates that the drive supports data compression and shall process data sent to it for transferal to the medium using the selected compression algorithm when the DCE bit is one. A DCC bit of zero indicates that the device does not support data compression. This shall be a non-changeable field. The SDT-10000/SDT-11000 has the capability to decompress data and will set this bit to a one.

DDE:

A data decompression enable (DDE) bit of one indicates that data decompression is enabled. Data Compression capability can not be turned off on SDT-10000/SDT-11000.

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RED:

The report exception on decompression (RED) field indicates the device’s response to a boundary condition caused by a change in the format of recorded data from: uncompressed to compressed or compressed to uncompressed This field only has an effect during reading not during writing. RED=00b When the RED field = 00b, the drive will report a CHECK CONDITION status (MEDIUM ERROR) whenever data is encountered on the media that the drive cannot decompress. The SDT-10000/SDT-11000 will not report CHECK CONDITION at a boundary condition as long as the data is uncompressed or DCLZ compressed. RED=01b A RED field of 01b is undefined and the drive will issue a CHECK CONDITION status with the sense key set to ILLEGAL REQUEST. RED=10b When the RED field = 10b, the drive shall return a CHECK CONDITION status whenever a boundary condition is encountered on the medium. The boundary conditions are: from uncompressed to compressed or from compressed to uncompressed CHECK CONDITION will be reported on the boundary condition even if the drive supports hardware decompression. For any of the boundary conditions which result in a CHECK CONDITION status, the additional sense code shall be set to either DECOMPRESSION EXCEPTION, ALGORITHM ID OF NN. The drive will set the decompression algorithm field to the algorithm identifier of the compression algorithm used to process the encountered data. The device shall be positioned on the EOP side of the encountered data, and the command-specific information field in the sense data shall contain a count of the number of data blocks contained within the encountered data. Note: When compressed data is encountered on the medium which the device cannot decompress, the device should

treat the data as a single variable-length record. In the sense data, the valid bit, the ILI bit and the information

field should be set accordingly. RED=11b A RED field of 11b is undefined and the drive will issue a CHECK CONDITION status with the sense key set to ILLEGAL REQUEST.

Compression Algorithm:

The compression algorithm field indicates the compression algorithm the drive will use to process data sent to it by the initiator (if the DCE bit is one). The SDT-10000/SDT-11000 supports the DCLZ data compression algorithm which is identified by the value: 00 00 00 20h in the compression algorithm field. A value of zero shall indicate that no compression algorithm is currently selected. Any other values in this field will cause the drive to return a CHECK CONDITION status the sense key shall be set to ILLEGAL REQUEST.

MODE SELECT

Decompression Algorithm:

For MODE SELECT the decompression algorithm field indicates the decompression algorithm selected by the initiator for use in subsequent decompression of data encountered on the medium. The SDT-10000/SDT-11000 can decompress data recorded with the DCLZ algorithm therefore this field can be set to 00 00 00 20h. However, the SDT-10000/SDT-11000 is capable of automatic recognition of the compression algorithm used to process the data encountered on the medium. Therefore, the drive will override the value in the decompression field (if is set to zero) for a subsequent read operation when DCLZ compressed data is detected on the media.

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Note: A CHECK CONDITION will occur on the transition from uncompress to compressed if RED = 10b.

For the MODE SENSE command, the decompression algorithm field reflects either the algorithm selected by the initiator or compression algorithm which was used to process the data most recently encountered on the medium, during a read operation. A value of zero shall indicate that the data encountered on the medium during the most recent read operation was uncompressed.

MODE SELECT

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6. 07. 3 Device Configuration Page

The drive supports the Device Configuration Page which has the following format:

Bit76543210

Byte

0 PS (0) Reserved Page Code (10h) 1 Page Length (0Eh) 2 Reserved CAP CAF Active Format 3 Active Partition 4 Write Buffer Full Ratio (00h) 5 Read Buffer Empty Ratio (00h) 6 (MSB)

Write Delay Time

7 (LSB)

MODE SELECT

8 DBR (0) BIS (1) RSmk AVC (0) SOCF (00b) RBO (0) REW

9 Gap Size (00h) 10 EOD Defined (000b) EEG (1) SEW Reserved 11 (MSB) 12 Buffer Size at Early Warning (00 00 00h) 13 (LSB) 14 Select Data Compression Algorithm 15 Reserved

Table 6-30: Device Configuration Page

CAP:

The Change Active Partition bit, then set to one, indicates that the logical partition is changed to the one specified by the Active Partition Field. This is a feature supported by the drive and is discussed below.

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CAF:

The Change Active Format bit, set to one, indicates that the active format is to be changed to that set in the Active Format Field.

Active Format:

The definition of this field is DAT specific. This field is used to enable DDS format options and is described below:

43210

Disable RAW ECC-3 N-Group

Disable RAW:

This bit is used to enable or disable the use of Read-After-Write error detection. If this bit is NOT set, RAW is enabled. This is the drive’s default configuration.

ECC-3:

This bit is used to enable or disable the use of Third Level Error Correction (ECC-3). If this bit is set, ECC-3 is enabled. This is the drive’s default configuration.

N-Group:

The value of this field indicates the number of times a group will repeatedly be written to tape. The default is zero repetitions. This feature may be used to performance match the drive with the Host. A decode of the field is shown below: This field will not be used on DDS-3 and DDS-4.

MODE SELECT

Table 6-31: Active Format

2 1 0 Number of Repetitions

0 0 0 0 (Default) 001 1 010 2 011 3 100 4 101 5 110 6 111 7

Table 6-32: N-Group field values

Active Partition:

Indicates the current logical partition number in use on the medium. The partition number may be either partition 0 or 1. Setting this field to any other values will be rejected by the drive with a CHECK CONDITION status and the ILLEGAL REQUEST sense key set.

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The drive will default to Partition 0 if the drive has been power-cycled, has received a BUS DEVICE RESET message, a Hard RESET or a tape is loaded. This is irrespective of whether the tape has been partitioned or not. If the media is to be used in the two partition format, the media must first be initialized using MODE SELECT Medium Partitions Parameter Page. If the currently loaded tape has not been formatted to be a two partition tape and the Host requests the Active Partition to be changed via the CAP and Active Partition fields, then the drive will return a CHECK CONDITION status with a MEDIUM ERROR sense key set.

Write Buffer Full Ratio and Read Buffer Empty Ratio:

These fields are not supported by the drive. Setting these fields to anything other than zero will cause the drive to return a CHECK CONDITION status and an ILLEGAL REQUEST sense key. The drive implements an algorithm which automatically adjusts these ratios so as to maximize streaming to the Host.

Write Delay Time:

This field indicates the maximum time, in 100 millisecond increments, that the drive shall wait with a partially full buffer before forcing the data to tape. The drive defaults to a 10 second delay since the last SCSI bus activity before the data is flushed from the buffer to the tape. If Write Delay Time is set to zero the drive will wait indefinitely for

the data group to be filled. DBR: This field is not supported and should be always set to 0. BIS: Block Identifiers Supported is set to one to indicate that the media has recorded information about the logical

block ID relative to the partition. The DBR and BIS bit are only valid on a MODE SENSE command where they are used to report drive capabilities. These bits are ignored by the drive on a MODE SELECT command. The drive will not return a CHECK CONDITION.

RSmk:

The Report Set Mark bit, when set to one, indicates that Save Set Marks will be reported to the drive. When zero,

Save Set Marks are NOT reported. The default is one, Save Set Marks reported. AVC:

Automatic Velocity Control function is not supported by the drive and if this bit is set a CHECK CONDITION

status is returned with an ILLEGAL REQUEST sense key. SOCF:

Stop on Consecutive Filemarks function is not supported by the drive and if this bit is set a CHECK CONDITION

status is returned with an ILLEGAL REQUEST sense key. RBO:

This field is not supported. If this bit is set a CHECK CONDITION status is returned with an ILLEGAL REQUEST

sense key. REW:

The drive returns Report Early-Warning End-of-Media bit not set. This indicates that the drive will not report the

early-warning condition on reads but will report early-warning on writes at a distance of 1500 mm (:DDS2/3 , 500

mm: DDS-1) before the physical End-Of-Partition Gap Size:

This field is not used by the DDS format and shall be set to zero otherwise a CHECK CONDITION with an

ILLEGAL REQUEST sense key will be returned. EOD Defined:

This field shall always be set to zero so that the drive will use its default EOD definition to detect and generate EOD.

Any other value will cause the drive to return a CHECK CONDITION status with an ILLEGAL REQUEST sense

key set.

MODE SELECT

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EEG:

The Enable EOD Generation bit shall always be set to indicate that drive will generate an EOD. The drive generates an EOD mark prior to any change of direction, if that change follows a write-type operation. This bit is only valid on the MODE SENSE command where it is used to report drive capabilities. This bit is ignored by the drive on a MODE SELECT command. The drive will not return a CHECK CONDITION.

SEW:

The Synchronize at Early-Warning bit is always set to ONE indicates buffered write data. File-marks and Set-marks at or after Early-Warning End-of-Media will be written to the Medium. The SEW bit changeable. A value of ZERO indicates that the target will retain any unwritten buffered data. File-marks, or Set-marks in the buffer when logical Early-Warning is encountered. The default is 0.

Buffer Size at Early Warning:

This field is not supported by the drive and if set a CHECK CONDITION status is returned with an ILLEGAL REQUEST sense key set.

Select Data Compression Algorithm:

The SDT-10000/SDT-11000 supports the Data Compression Page and that page should be used instead of this field to control Data Compression. This field is not supported by the drive and if set a CHECK CONDITION status is returned with an ILLEGAL REQUEST sense key set.

MODE SELECT

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6. 07. 4 Medium Partitions Parameter Page

The drive supports the Medium Partitions Parameter Page, which has the following format:

Bit76543210

Byte

0 PS (0) Reserved Page Code (11h) 1 Page Length (0Ah) 2 Maximum Additional Partitions (01h) 3 Additional Partitions Defined (00h or 01h) 4 FDP (0) SDP (0) IDP PSUM (10b) Reserved 5 Medium format Recognition (03h) 6 Reserved 7 Reserved

MODE SELECT

8 (MSB)

9 (LSB) 10 (MSB) 11 (LSB)

Partition Size (Partition 0)

Partition Size (Partition 1)

Table 6-33: Medium Partitions Parameter Page

Warning: This page is used to format a tape to one or two partitions. Extreme care must be used with this

parameter page to avoid accidental reformatting of a tape.

Maximum Additional Partitions:

This field is only valid on MODE SENSE where it is used report the maximum number of additional partitions that are supported by the drive, which is one.

Additional Partitions Defined:

This field specifies the number of additional partitions to be defined for the tape based on the IDP bit. The maximum allowed is the value returned in the Maximum Additional Partitions field, which for the drive is one. Therefore, the supported values are zero or one.

If the Mode Sense command is issued with the Parameter List Length set to 16h, the Page Length that is returned will be 8 bytes, and the value for Partition 1 will be returned in bytes 8, 9. The value for Partition 0 is not returned in this case.

For issuing Mode Select with Additional Partition Defined = 0, the command will function properly even when the Parameter List Length of the CDB is set to 14h. In this case, it is necessary to set the Parameter Length to 6h.

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FDP:

The Fixed Data Partitions bit is not supported by the drive and if set, a CHECK CONDITION status is returned with an ILLEGAL REQUEST Sense Key set.

SDP:

The Select Data Partitions bit is not supported by the drive and if set, a CHECK CONDITION status is returned with an ILLEGAL REQUEST Sense Key set.

IDP:

The Initiator Defined Partitions bit is supported and, when set to one, indicates that the tape shall be partitioned based on the Additional Partitions Defined field, PSUM and Partition Size field. Setting of this bit is only valid at BOM, otherwise the drive will return a CHECK CONDITION status with an ILLEGAL REQUEST Sense Key set.

The DDS format allows the tape to be split into two entirely separate and independent partitions. Each partition will have its own Reference, System and Vendor Group area. Each partition will have a minimum size of 2541 frames. The maximum size of a partition will be the whole tape. The partitions may exist together or the entire tape may be treated as a single partition. This is illustrated below:

MODE SELECT

Single Partition Tape

BOM BOT

Partition 0

Device Area System Area End of DataUser Data Area

Two Partition Tape

BOM BOT

Partition 1

Device Area

BOM = Beginning-of-Media (Physical) BOT = Beginning-of-Tape (Logical) EOM = End-of-Media (Physical) EOP = End-of-Partition (Logical) EOT = End-of-Tape (Logical)

System Area

User Data Area

End of Data

EOT

EOP/BOP

System Area

Partition 0

User Data Area

EOP/EOM

EOT

EOP/EOM

End of Data

EOT

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Note: The System area consists of three sub-sections:

Reference Area System Area Vendor Group

Figure 6-1: Tape Partition Layout

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The Host may, therefore, partition a tape into one partition which spans the whole physical length of the tape or into two partitions, each of which will behave as completely separate and independent tapes.

A tape does not require partitioning prior to use. If a Host only wishes to use a single partition tape, then there is no need to send this page. On the first WRITE to a blank tape, the device will create the System, Reference and Vendor areas on tape before proceeding with the write. To reformat from a two to a single, or from a single to a two partition tape, the Host is required to use the Medium Partitions Parameter page.

PSUM:

The Partition Size Unit of Measured field defines the units in which the Partition Size value selects the partition size, which in the case of this drive is Megabytes. Therefore, the drive returns 10b for a MODE SENSE and will only accept this value for a MODE SELECT, otherwise a CHECK CONDITION status is returned with an ILLEGAL REQUEST Sense Key set.

Medium Format Recognition:

This field is only valid on a MODE SENSE and is set to 03h to indicate that the drive is capable of format and partition recognition.

MODE SELECT

Partition Sizes:

This field allows the initiator to allocate the capacity of the second partition, Partition 1. It will also allow the initiator to reallocate the capacity of previously partitioned tapes.

The Partition Size specifies the capacity of Partition 1 in Megabytes. The drive rounds the Partition Size to the next whole group value and then applies an algorithm which allows for the writing of ECC-3 frames and for RAW error recovery so as to reserve sufficient physical space on the media for the specified capacity.

If the Additional Partitions Defined and Partition Size fields are set to zero the drive will initialize the tape as Partition 0, spanning the whole length of the tape.

Partition 0 size is only valid during MODE SENSE and is ignored during MODE SELECT Remaining Capacity goes to P.0.

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