seagate ST31200N, ST31200ND, ST31200NC, ST3620N Product Manual

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Hawk 1LP Family:

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ST31200N/ND/NC

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ST3620N/NC

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Product Manual, Volume 1

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Hawk 1LP Family:

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ST31200N/ND/NC

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ST3620N/NC

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Product Manual, Volume 1

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Seagate®, Seagate Technology®, and the Seagate logo are registered trademarks of Seagate Technology, Inc. HawkTM, SeaFAXTM, SeaFoneTM, SeaTDDTM and SeaBOARDTM are trademarks of Seagate Technology, Inc. Other product names are registered trademarks or trademarks of their own.

Seagate reserves the right to change, without notice, product offerings or specifications. No part of this publication may be reproduced in any form without written permission of Seagate Technology, Inc.

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Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. D v _____________________________________________________________________________________

Revision Status Summary Sheet

Revision Authority Date Writer/Eng. Sheets affected

A Issue 2/10/94 D. Ashby v thru viii, 1 through 68 B PLD: 85297 5/18/94 Jim Bently/ v, 14 and 20

Larry Wilcox C PLD: 85341 6/16/94 D. Ashby v, 2, 6, 11, 24, 27, 28, 50 thru 52. D PLD: 85489 03/17/95 J. Rust, J. Bentley v, 22, 23, 66, 67 and 68.

Notice:

Product Manual 77767452 is Volume 1of a two Volume document with the SCSI interface information in the Volume 2 SCSI Interface Product Manual, P/N 77738479.

If the SCSI Interface information is needed the Volume 2 Interface Manual should be ordered, P/N

77738479.

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vi Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. A ______________________________________________________________________________________

Table of Contents

1.0 Scope.......................................................................................................................................... 1

2.0 Applicable standards and reference documentation.............................................................. 2

2.1 Standards ....................................................................................................................... 2

2.2 Applicable reference documents..................................................................................... 2

3.0 General description ................................................................................................................... 3

4.0 Features...................................................................................................................................... 5

4.1 Performance ................................................................................................................... 5

4.2 Reliability ........................................................................................................................ 5

4.3 Unformatted and formatted capacities ............................................................................ 6

4.4 Options (factory installed) ............................................................................................... 6

4.5 Optional accessories (user installed) .............................................................................. 6

4.6 Installation....................................................................................................................... 7

5.0 Performance characteristics..................................................................................................... 8

5.1 Internal drive characteristics (transparent to user) .......................................................... 8

5.2 SCSI Drive Seek and write performance characteristics (visible to user)........................ 8

5.2.1 Seek command execution time .......................................................................... 8

5.2.2 Format drive command execution time .............................................................. 9

5.2.3 Read data command execution time.................................................................. 9

5.2.4 Write data command execution time .................................................................. 9

5.3 Generalized performance characteristics........................................................................ 10

5.4 Start/stop time................................................................................................................. 11

5.5 Prefetch/multi segmented cache control ......................................................................... 12

5.5.1 Cache operation................................................................................................. 12

5.5.2 Prefetch operation.............................................................................................. 13

5.6 Caching write data .......................................................................................................... 14

5.7 Synchronized spindle operation ...................................................................................... 14

6.0 Reliability specifications ........................................................................................................... 17

6.1 Error rates....................................................................................................................... 17

6.1.1 Read errors........................................................................................................ 17

6.1.2 Environmental interference ................................................................................ 17

6.1.3 Write errors ........................................................................................................ 18

6.1.4 Seek errors ........................................................................................................ 18

6.2 Reliability and service...................................................................................................... 18

6.2.1 Mean time between failure ................................................................................. 18

6.2.2 Preventive maintenance..................................................................................... 18

6.2.3 Service life ......................................................................................................... 18

6.2.4 Service philosophy............................................................................................. 19

6.2.5 Installation.......................................................................................................... 19

6.2.6 Service tools ...................................................................................................... 19

6.2.7 Product warranty................................................................................................ 19

7.0 Physical/electrical specifications ............................................................................................. 20

7.1 AC power requirements .................................................................................................. 20

7.2 DC power requirements .................................................................................................. 20

7.2.1 Conducted noise immunity................................................................................. 20

7.2.2 Power sequencing ............................................................................................. 21

7.2.3 12 V - current profile .......................................................................................... 21

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7.3 Heat/power dissipation.................................................................................................... 22

7.4 Environmental limits........................................................................................................ 22

7.4.1 Temperature ...................................................................................................... 22

7.4.2 Relative humidity................................................................................................ 23

7.4.3 Effective altitude (sea level ref) .......................................................................... 24

7.4.4 Shock and vibration ........................................................................................... 24

7.4.5 Air cleanliness.................................................................................................... 26

7.5 Electromagnetic compatibility.......................................................................................... 26

7.5.1 Electromagnetic susceptibility ............................................................................ 26

7.6 Mechanical specifications ............................................................................................... 27

7.6.1 Drive orientation................................................................................................. 29

7.6.2 Cooling............................................................................................................... 29

7.6.3 Drive mounting................................................................................................... 29

8.0 Media characteristics ................................................................................................................ 30

8.1 Media description............................................................................................................ 30

9.0 Defect and error management .................................................................................................. 31

9.1 Drive internal defects/errors............................................................................................ 31

9.2 SCSI systems error considerations................................................................................. 31

10.0 Option/configuration headers................................................................................................... 32

10.1 Drive ID/Option select header ......................................................................................... 32

10.2 Synchronized spindles interface ..................................................................................... 35

10.2.1 Electrical description .......................................................................................... 35

10.3 Grounding....................................................................................................................... 37

11.0 Interface requirement ................................................................................................................ 38

11.1 General description......................................................................................................... 38

11.2 SCSI interface messages supported............................................................................... 38

11.3 SCSI interface commands supported ............................................................................. 39

11.3.1 Inquiry data ........................................................................................................ 41

11.3.2 Mode sense data ............................................................................................... 42

11.4 SCSI bus conditions and miscellaneous Features supported ......................................... 47

11.5 Synchronous data transfer.............................................................................................. 48

11.5.1 Synchronous data transfer periods supported.................................................... 48

11.5.2 REQ/ACK offset ................................................................................................. 48

11.6 Physical interface............................................................................................................ 48

11.6.1 DC cable and connector..................................................................................... 50

11.6.2 Physical characteristics...................................................................................... 50

11.6.3 Mating connector requirements.......................................................................... 51

11.6.4 Electrical description .......................................................................................... 58

11.7 Disc drive timing ............................................................................................................. 62

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12.0 Options....................................................................................................................................... 64

12.1 Front Panel ..................................................................................................................... 64

12.2 Single unit shipping ppack .............................................................................................. 64

13.0 Accessories ............................................................................................................................... 65

13.1 Front panel kit ................................................................................................................. 65

13.2 Installation manual .......................................................................................................... 65

14.0 Seagate support services ......................................................................................................... 66

Seagate peripheral family ...................................................................................................................... 67

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Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. A 1 ______________________________________________________________________________________

1.0 Scope

This Manual describes the Hawk 1LP family ST31200N/ND/NC and ST3620N/NC models members of the Seagate Technology, Inc. Hawk 1LP Family Disc Drive. This high capacity, high performance member of the Seagate 1 inch high 3.5 inch rigid disc family is a companion product to the ST11200 disc drive. Performance information is given in Section 5. The Hawk 1LP Family drive interface is defined for functional compatibility to be a subset of the Seagate SCSI Interface Manual 77738479, and the ANSI SCSI-2 and SCSI-3 standards. The Hawk 1LP Family drives are classified as “Intelligent” peripherals. The Hawk 1LP Family provides Level 2 conformance (highest level) with the ANSI SCSI-1 standard. Details of the Hawk 1LP Family drive SCSI implementation are provided in Section 11 of this Manual, (Vol. 1) and in the SCSI Interface Product Manual P/N 77738479 (Vol. 2; Ver. 2).

From this point on in this Product Manual the reference to Hawk 1LP Family is referred to as “the drive” (unless reference to individual models are necessary).

The drive printed circuit board is referred to as a PCB.

*50 pin/4 pin I/O and DC power connector shown. Models ST31200NC and ST3620NC have a single 80 pin connector for both SCSI I/O and power.

Figure 1-1. Hawk 1LP family drive

SEAGATE

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2.0 Applicable standards and reference documentation

The drive has been developed as a system peripheral to the highest standards of design and construction. The drive depends upon its host equipment to provide adequate power and environment in order to achieve optimum performance and compliance with applicable industry and governmental regulations. Special attention must be given in the areas of safety, power distribution, shielding, audible noise control, and temperature regulation. In particular, the drive must be securely mounted in order to guarantee the specified performance characteristics.

2.1 Standards

The Hawk 1LP Family complies with Seagate standards as noted in the appropriate sections of this Manual and the Seagate SCSI Interface Manual, P/N 77738479 (Vol. 2, Version 2).

The Hawk 1LP Family is a UL Recognized component per UL 1950 and a CSA Certified component per CAN/ CSA-C22.2 No. 950-M89. It also meets the requirements of DIN VDE 0805/05.90 and EN60950: 1988 (IEC

950). The drive, as delivered, is designed for system integration and installation into a suitable enclosure prior to use.

As such the drive is supplied as a subassembly and is not subject to Subpart J of Part 15 of the FCC Rules and Regulations nor the Radio Interference Regulations of the Canadian Department of Communications. However, the unit has been tested using proper shielding and grounding and found to be compliant with Class A limits of the FCC Rules and the Regulations of The Canadian Department of Communications.

The physical design characteristics of the drive serve to minimize radiation when installed in an enclosure that provides reasonable shielding. As such, the drive is capable of meeting the Class B limits of the FCC Rules and Regulations of the Canadian Department of Communication. However, it is the users responsibility to assure that the drive meets the appropriate EMI requirements in their system. Shielded I/O cables may be required if the enclosure does not provide adequate shielding. If the I/O cables are external to the enclosure, shielded cables should be used, with the shields grounded to the enclosure and to the host controller.

2.2 Applicable reference documents

Hawk 1LP Family Installation Guide Seagate P/N 77767453 SCSI Interface Manual Seagate P/N 77738479 ANSI Small Computer System Interface (SCSI): Document Number ANSI3.131-1986 (X3T9/84.40 Rev. 1B) (X3T9.2/82-2 Rev. 17B), X3T9.2/86-109 Revision 10H (SCSI-2) and X3T9.2-184 Rev. 4 (SCSI-3).

Package Test Specification Seagate P/N 30190-001 (under 100 lb.) Package Test Specification Seagate P/N 30191-001 (over 100 lb.)

In case of conflict between this document and any referenced document, this document takes precedence.

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Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. A 3 _____________________________________________________________________________________

3.0 General description

The drives are a member of a family of low cost, high performance, highly reliable, random access storage devices designed to meet the needs of the OEM marketplace.

The drive records and recovers data on 3.7 inch (95 mm) fixed discs. The drive supports the Small Computer System Interface (SCSI-2 and SCSI-3) as described in the ANSI

SCSI-1 and SCSI-2/SCSI-3 Interface Manuals to the extent described in this product Manual (Vol. 1), which defines the product performance characteristics of the Hawk 1LP Family of drives, and the SCSI Interface Product Manual P/N 77738479 (Vol. 2, Version 2) which describes the general interface characteristics of this and other families of Seagate 3.5-inch drives.

The drive interface supports multiple initiators, disconnect/reconnect, self configuring host software and automatic features that relieve the host from the necessity of knowing the physical characteristics of the targets (logical block addressing is used).

The Head/Disc Assembly (HDA) is environmentally sealed at the factory. Air recirculates within the Head/Disc (HDA) through a nonreplaceable filter to maintain a contamination free head/disc environment.

Refer to Figure 3.0-1 an exploded view of the drive. NEVER disassemble the Head/Disc Assembly (HDA). This exploded view is for information only. Do not attempt to service items in the sealed environmental enclosure (heads, media, actuator, etc.) as this requires special facilities. The drive contains no parts replaceable by the user. The drive warranty is voided if the HDA is opened.

The Hawk 1LP Family drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the landing zone when the power is removed.

The Hawk 1LP Family drives incorporate an automatic shipping lock which prevents potential damage to the heads and discs that result from movement during shipping and handling. The shipping lock is automatically disengaged when power is applied to the drive and the head load process begins.

The Hawk 1LP Family drives decode track 0 location from the dedicated servo surface to eliminate mechanical transducer adjustments and related reliability concerns.

The Hawk 1LP Family drives use a high performance actuator assembly that consists of a low inertia, balanced, patented, straight arm design that provides excellent performance with minimum power dissipation.

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ST31200N/ND PCB ST31200NC PCB

Figure 3.0-1. Hawk 1LP family drive

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Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. A 5 ______________________________________________________________________________________

4.0 Features

The Hawk 1LP Family has the following standard features:

• Integrated SCSI Controller

• Single Ended and Differential SCSI drivers and receivers

• Asynchronous and Synchronous data transfer protocol

• Firmware downloadable via SCSI interface

• Selectable sector size from 256 to 4096 bytes/sector

• Programmable sector reallocation scheme

• Flawed sector reallocation at format time

• Programmable auto write and read reallocation

• Reallocation of defects on command (Post Format)

• 96 bit Reed-Solomon error correcting code

• Sealed Head/Disc Assembly

• No preventative maintenance or adjustment required

• Dedicated head landing zone

• Automatic shipping lock

• Automatic Thermal Compensation

• Patented Tri-phase Servo with embedded Grey Code Track Address to guarantee servo positioning.

• Self diagnostics performed at power on

• 1:1 Interleave

• Zoned Bit Recording (ZBR)

• Vertical, horizontal, or top down mounting

• Dynamic spindle brake

• Permanantly mounted terminators on model ST31200N, enabled by installation of a jumper plug.

• Synchronous spindle capability

• 256 Kbyte data buffer (optional 1 MB available)

4.1 Performance

• Programmable multi-segmentable cache buffer

• Automatic Adaptive Cache

• Zero Latency Reads

• 5411 RPM Spindle. Average latency = 5.54 ms

• Command Queuing of up to 64 commands

• Background processing of queue

• Supports start and stop commands

• Provides synchronized spindle capability

• Low audible noise for office environment

• Low power consumption

4.2 Reliability

• 500,000 hour MTBF

• Adaptive seek velocity. Improved seek performance

• LSI circuitry

• Balanced low mass rotary voice coil actuator

• 5 year warranty

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4.3 Unformatted and formatted capacities

Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per sector. The following table shows some

Spare Sectors or Cylinders ST31200N/ND/NC ST3620N/NC

Reserved for reallocation MB MB

No Spares 1068.27 1145.7 553.1 584.3 Nine Spare Sectors Per Cylinder [2] 1055.28 1120.29 545.9 570.2 2 Spare Cylinders per Unit [3] One Spare Sector per cyl. 1066.33 1142.39 551.4 581.2 2 Spare Cyl. per Unit [3] Unformatted Capacity 1258.8 651.8

Notes.

[1] Bytes per sector. Sector size selectable at format time. Users having the necessary equipment may modify

the data block size before issuing a format command and obtain different formatted capacities than those listed. User available capacity depends on spare reallocation scheme selected. See Mode Select

Command and Format Command in the SCSI Interface Product Manual P/N 77738479. [2] All nine spare sectors are on one track. [3] Spare cylinders are on the two inner tracks.

typical

formatted capacities.

512[1] 1024[1] 512[1] 1024[1]

The standard OEM model is as follows:

Formatted Data Block Size* Unformatted 512 Byte/Sector

ST31200N/ND/NC 1055.28 MB 1258.8 MB ST3620N/NC 545.9 MB 651.8 MB

*Nine Spare Sectors per cylinder (all nine spare sectors are on one track), Two spare cylinders/unit.

4.4 Options (factory installed)

The capacities shown in paragraph 4.3 are available upon request. Other capacities can be ordered depending on sparing scheme and sector size requested.

The following options are incorporated at the time of production. See Section 12.0.

• Front panel (green LED) - See Figure 3.0-1

• Installation Guide P/N 77767453

• 1 MB Data buffer

4.5 Optional accessories (user installed)

The following accessories are available. All kits may be installed in the field. See Section 13.0.

• Front Panel Kit (with green LED) - See Figure 3.0-1

• Single Unit shipping pack kit

• Installation Guide P/N 77767453

• Adapter Accessory Frame Kit P/N 75790701 (adapts 3.5-inch drive to fit in 5.25-inch drive mounting space)

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Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. A 7 ______________________________________________________________________________________

4.6 Installation

For option jumper locations and definitions refer to Figure 10.1-1. Drive default mode parameters are not normally needed for installation. Refer to Section 11.3.2 for default mode parameters if they are needed.

• Ensure that the SCSI ID of the drive is not the same as the host adapter. Most host adapters use SCSI ID

• If multiple devices are on the bus set the drive SCSI ID to one that is not presently used by other devices on

the bus.

• If the drive is the only device on the bus, attach it to the end of the SCSI bus cable. Permanently installed

terminators must be enabled on the drive for ST31200N/ST3620N and ST31200NC/ST3620NC models using jumper plug TE. On ST31200ND models, external terminators must be provided by the user, systems integrator or host equipment manufacturer.

• If the drive is attached to a bus that contains other devices, and the new drive is not attached to the end of

the bus, the Terminator Enable jumper (TE) should be removed from the new drive.

• Set all appropriate option jumpers for desired operation prior to power on. If jumpers are changed after power

has been applied, recycle the drive power to make the new settings effective.

• Installation instructions are provided by host system documentation or with any additionally purchased drive

installation software. If necessary see section 14.0 for Seagate support services telephone numbers.

• The Manufacturers installed labels must not be removed from the drive or covered with additional labels, as

they contain information required when servicing the product.

Formatting

• It is not necessary to low level format this drive. The drive is shipped from the factory low level formatted in

512 byte sectors.

• Reformat the drive if one of the following occurs.

- A different sector size is selected.

- A different spare sector allocation scheme is selected.

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5.0 Performance characteristics

5.1 Internal drive characteristics (transparent to user)

ST31200N/ND/NC ST3620N/NC

Drive Capacity 1258.8 651.8 MByte (UNF) Read/Write Heads 9 5 (Max) Bytes/Track 51803.0 48283 Bytes (Avg) Bytes/Surface 139.8 130.4 Mbytes (UNF) Tracks/Surface, Total 2700 2700 Tracks (user accessible) Tracks/Inch 3000 3000 TPI Servo Heads 1 1 Internal Data Rate 47.2 - 26.8 42.4 - 24.4 Mbits/sec (variable with zone) Disc Rotational Speed 5411+ 0.5% 5411+ 0.5% r/min

Average Rotational Latency 5.54 5.54 ms

5.2 SCSI Seek, Read and Write performance characteristics (visible to user) [8]

Refer to Section 11.7 and to the SCSI-2 Interface Product Manual 77738479 for additional timing details.

5.2.1 Seek time

Drive Level Drive Level ST31200N/ND/NC ST3620N/NC

Read Write Read Write

ms ms

Average - Typical*[3] 9.3 10.5 9.3 10.5

Max. [2] 11.0 12.5 11.0 12.5

Single Track - Typical [3] 1.2 1.7 1.2 1.7

Max. [2] 3.0 3.5 3.0 3.5

Full Stroke - Typical [3] 19.4 20.4 19.4 20.4

Max. [2] 22.9 23.9 22.9 23.9

Including Controller Overhead (without disconnect) [1] [4]

Drive Level Drive Level ST31200N/ND/NC ST3620N/NC

Read Write Read Write

ms ms

Average - Typical [3] 10.2 11.4 10.2 11.4

Max. [2] 11.9 13.4 11.9 13.4

Single Track - Typical [3] 2.1 2.5 2.1 2.5

Max. [2] 3.8 4.3 3.8 4.3

Full Stroke - Typical [3] 20.4 21.4 20.4 21.4

Max. [2] 23.9 24.9 23.9 24.9

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Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. A 9 ______________________________________________________________________________________

5.2.2 Format drive command execution time (minutes) [1]

Maximum (with verify) 25 Maximum (no verify) 17

*[ ] Notes are listed in Section 5.3.1.

5.2.3 Read data command execution time [4]

512 byte sector size, without disconnect and with read look ahead cache disabled). Latency time is included.

a. From CDB reception to the drive request for the first data byte to be transferred to the Host

1. Typical (Zero Stroke Seek) 7.32 ms [3]*

2. Typical (Average Seek) 17.14 ms [3]

3. Maximum (Full Stroke Seek) 31.78 ms [2]

b. Single Sector Read and Transfer of data to Host (time from receipt of last byte of the CDB to the request

for a status byte transfer to Host) [7].

1. Typical (Zero Stroke Seek) 7.42 ms [3]

2. Typical (Average Seek) 17.24 ms [3]

3. Maximum (Full Stroke Seek) 31.84 ms [2]

5.2.4 Write data command execution time [4]

(512 byte sector size, without disconnect and with read look ahead disabled) Latency time is included.

a. From CDB reception to the request for the first byte of write data from the Host.

1. Typical 1.49 ms 2. Maximum 1.61 ms

b. Single Sector Write and Data Transfer from Host [7] [6]

(Time from receipt of the last byte of the CDB to the request for a completion status transfer to the

Host)

1. Typical (Zero Stroke Seek) 7.72 ms [3]

2. Typical (Average Seek) 17.29 ms [3]

3. Maximum (Full Stroke Seek) 32.28 ms [2]

*[ ] All notes are listed in Section 5.3.1.

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5.3 Generalized performance characteristics

Minimum Sector Interleave 1 to 1 Data Buffer To/From Disc Media

Data transfer rate (< 1 sector) - 512 Byte Sector

Min. [4] 3.35 MByte/sec Avg. [4] 4.59 MByte/sec Max. [4] 5.35 MByte/sec

Data Buffer To/From Disc Media

Data Transfer Rate (< 1 Track) - 512 Byte Sector

Min. [4] 2.88 MByte/sec divided by (Interleave Factor) Avg. [4] 3.94 MByte/sec divided by (Interleave Factor) Max. [4] 4.6 MByte/sec divided by (Interleave Factor)

SCSI Interface Data

Transfer Rate (Asynchronous) [5]

N/NC family models ND family models

-Maximum Instantaneous 5.2** MBytes/sec 3.3 MBytes/sec

-Maximum Average 3.1 MBytes/sec 2.4 MBytes/sec Sector Sizes 512 byte user data blocks (default)

Variable (256 to 4096 bytes per sector) in even number of bytes per sector. If n (number of

bytes per sector) is odd, then n-1 will be used. Synchronous Transfer Rate From 1.25 MBytes/sec to 10.0 MBytes/sec (See section 11.5.)

Read/Write consecutive sectors on a track YES Flaw reallocation performance impact (For flaws reallocated at format Negligible

time using the spare sectors per track reallocation scheme.)* Flaw reallocation performance impact (For flaws reallocated at format time Negligible

using the spare sectors per cylinder reallocation scheme.)* *Simulated Flaw reallocation performance impact (For flaws reallocated at format 35 ms (typical)

time using the spare tracks per volume reallocation scheme.) Overhead time for head switch (512 byte sectors) 1 ms

Overhead time for one track cylinder switch <3 ms Typical Average rotational latency 5.54 ms

*[ ] Notes listed in Section 5.3.1 ** Assumes system ability to support 5.2 Mb/s and no cable loss.

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Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. C 11 ______________________________________________________________________________________

5.3.1 Notes for sections 5.2 and 5.3.

[1] Execution time measured from receipt of the last Byte of the Command Descriptor Block (CDB) to the

request for a Status Byte Transfer to the Initiator (excluding connect/disconnect).

[2] Maximum times are specified over the worst case conditions of temperature, voltage margins and drive

orientation. When comparing specified seek times, care should be taken to distinguish between typical seek times and maximum seek times. The best comparison is obtained by system benchmark tests conducted under identical conditions. Maximum times do not include error recovery.

[3] Typical Seek values are measured under nominal conditions of temperature, voltage, and horizontal

orientation as measured on a representative sample of drives. [4] Assumes no errors and no sector has been relocated. [5] Rate measured from the start of the first sector transfer to or from the Host. [6] Assumes the Initiator immediately sends Write Data to the drive when requested. [7] Command execution requires a data transfer phase (data to or from the disc media). Assumes the initiator

is instantly ready to send or receive the data when the drive generates first request for a data byte transfer,

and assumes an average data transfer rate between the drive and the Initiator as specified in section 5.3. [8] All performance characteristics assume that automatic adaptive temperature compensation is not in

process when the SCSI command is received. A SCSI command being executed is not interrupted for

automatic adaptive temperature compensation. If adaptive thermal compensation is in process when a

SCSI command is received, the command is queued until the compensation for the specific head being

compensated completes. When compensation completes for the specific head being compensated, the

first queued SCSI command is executed. When execution of the first queued command is complete, the

drive continues the compensation for the remaining head(s). The above procedure continues until

compensation for all heads is completed, or until one minute has elapsed. If the compensation for all heads

is not complete in one minute the drive performs compensation for all of the remaining heads sequentially

without any interruption. The drive initiates an automatic adaptive temperature compensation cycle

approximately one minute after power-on, and approximately once every 10 minutes thereafter. Automatic

adaptive temperature compensation takes less than 0.1% of bus time. Automatic temperature compen-

sation also occurs at other times, but should be transparent to the user (e.g., during format, Rezero

Command, at spindle up, during read error recovery, and during Reassign Block functions). A Rezero

command can be used to reset the thermal compensation timer back to its start so that the host can know

when the next interruption for thermal compensation will occur.

5.4 Start/stop time

After DC power has been applied, all drive types except the 1.0 MB RAM Option becomes ready within 20 seconds (15 seconds typical) if the Motor Start option is disabled (i.e. the motor starts as soon as the power has been applied). After DC power has been applied, the drive with 1.0 MB RAM option becomes ready within 35 seconds (25 seconds typical) if the Motor Start option is disabled (i.e. the motor starts as soon as the power has been applied). During this time the drive responds to some commands over the SCSI interface* in less than 3 seconds. Stop time is less than 20 seconds from removal of DC power.

If the Motor Start Option is enabled, the internal controller accepts the commands listed in the SCSI Interface Product Manual* less than 3 seconds after DC power has been applied. After the Motor Start Command has been received the drive becomes ready for normal operations within 13 seconds typically. The Motor Start Command can also be used to command the drive to stop the spindle*.

There is no power control switch on the drive.

__________ *SCSI commands are described in the SCSI Interface Product Manual Volume 2, P/N 77738479

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5.5 Prefetch/multi segmented cache control

The drive provides prefetch (read look-ahead) and multi-segmented cache control algorithms that in many cases can enhance system performance. “Cache” as used herein refers to the drive buffer storage space when it is used in “cache” operations. To select prefetch and cache features the host sends the Mode Select command with the proper values in the applicable bytes in Mode Page 08h*. Prefetch and cache operation are independent features from the standpoint that each is enabled and disabled independently via the Mode Select command. However, in actual operation the prefetch feature overlaps cache operation somewhat as is noted in sections 5.5.1 and 5.5.2.

All default cache and prefetch Mode parameter values (Mode Page 08h) for standard OEM versions of this drive family are given in Tables 11.3.2-1 through 11.3.2-4.

5.5.1 Cache operation

In general, 240 Kbytes of the 256 Kbytes of physical buffer space in the drive can be used as storage space for cache operations (984 Kbytes of 1 MB for drives having the optional 1 MB buffer). The buffer can be divided into logical segments (Mode Select Page 08h, byte 13) from which data is read and to which data is written. The drive maintains a table of logical block disk medium addresses of the data stored in each segment of the buffer. If cache operation is enabled (RCD bit = 0 in Mode Page 08h, byte 2, bit 0. See SCSI Interface Product Manual*), data requested by the host with a Read command is retrieved from the buffer (if it is there), before any disc access is initiated. If cache operation is not enabled, the buffer (still segmented with required number of segments) is still used, but only as circular buffer segments during disc medium read operations (disregarding Prefetch operation for the moment). That is, the drive does not check in the buffer segments for the requested read data, but goes directly to the medium to retrieve it. The retrieved data merely passes through some buffer segment on the way to the host. All data transfers to the host are in accordance with “buffer-full” ratio rules. See explanations associated with Mod page 02h (disconnect/reconnect control) in the SCSI Interface Product Manual*.

The following is a simplified description of a read operation with cache operation enabled: Case A - A Read command is received and the first logical block (LB) is already in cache:

1. Drive transfers to the initiator the first LB requested plus all subsequent contiguous LB’s that are already

in the cache. This data may be in multiple segments.

2. When the requested LB is reached that is not in any cache segment, the drive fetches it and any remaining

requested LB’s from the disc and puts them in a segment of the cache. The drive transfers the remaining

requested LB’s from the cache to the host in accordance with the disconnect/reconnect specification

mentioned above.

3. If the prefetch feature is enabled, refer to section 5.5.2 for operation from this point.

__________ *SCSI Interface Product Manual, 77738479.

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Case B - A Read command requests data, the first LB of which is not in any segment of the cache:

1. The drive fetches the requested LB’s from the disc and transfers them into a segment, and from there to

the host in accordance with the disconnect/reconnect specification referred to in case A.

2. If the prefetch feature is enabled, refer to section 5.5.2 for operation from this point. Each buffer segment is actually a self-contained circular storage (wraparound occurs), the length of which is

an integer number of disc medium sectors. The wrap-around capability of the individual segments greatly enhances the buffer’s overall performance as a cache storage, allowing a wide range of user selectable configurations, which includes their use in the prefetch operation (if enabled), even when cache operation is disabled (see section 5.5.2). For the ST31200N/ND and ST3620N/ND drives the selected using the Mode Select command, but the size can not be directly selected. Size is selected only as a by-product of selecting the segment number specification. The size in Kbytes of each segment is reported by the Mode Sense command page 08h, bytes 14 and 15. If a size specification is sent by the host in a Mode Select command (bytes 14 and 15) no new segment size is set up by the drive, and if the “STRICT” bit in Mode page 00h (byte 2, bit 1) is set to one, the drive responds as it does for any attempt to change unchangeable parameters (see SCSI I/O Product Manual*). The Hawk 1LP family of drives supports operation of any integer number of segments from 1 to 16. Divide the 245,760 bytes (1,007,616 bytes for the optional 1 MB buffer) in the buffer by the number of segments to get the size (in bytes) of each segment.

5.5.2 Prefetch operation

number

of segments may be

If the Prefetch feature is enabled, data in contiguous logical blocks on the disc immediately beyond that which was requested by a Read command can be retrieved and stored in the buffer for immediate transfer from the buffer to the host on subsequent Read commands that request those logical blocks (this is true even if “cache” operation is disabled). Though the prefetch operation uses the buffer as a “cache”, finding the requested data in the buffer is a prefetch “hit”, not a “cache” operation “hit”. Prefetch is enabled using Mode Select page 08h, byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch. Since data that is prefetched replaces data already in some buffer segment(s), the host can limit the amount of prefetch data to optimize system performance. The drive never prefetches more logical blocks than the number specified in the prefetch logical blocks ceiling bytes (8 and 9) of Mode page 08h.

During a prefetch operation, the drive crosses a cylinder boundary to fetch more data only if the Discontinuity (DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h.

The operation of the prefetch feature (when enabled by DRA = 0) can be modified to an adaptable prefetch mode, wherein prefetch is disabled as long as two sequential read operations are not for contiguous blocks of data. If two sequential Read operations request contiguous logical blocks of data, the drive automatically enables the prefetch feature for the end of the second Read operation. As long as sequential Read operations request contiguous LB’s of data, prefetch operation remains enabled.

If the host uses software interleave, there will not likely ever be two sequential Read operations for contiguous LB’s, so the adaptive prefetch feature keeps prefetch disabled, even if the DRA bit enables it. Adaptive prefetch is enabled when the IC (Initiator Control) bit (Mode page 08h, byte 2, bit 7) is set to 0 and when DRA = 0 (prefetch enabled).

__________ *SCSI Interface Product Manual, P/N 77738479.

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5.6 Caching write data

Write caching is a write operation by the drive that makes use of a drive buffer storage area where the data to be written to the medium is stored in one or more segments while the drive performs the write command.

Write caching is enabled along with read caching. For write caching, the same buffer space and segmentation is used as set up for read functions. The buffer segmentation scheme is set up or changed independently, having nothing to do with whether or not read and write caching is enabled or disabled. When a write command is issued, the cache is first checked to see if any logical blocks that are to be written are already stored in the cache from a previous read or write command. If there are, the respective cache segments are cleared. The new data is cached for subsequent Read commands.

If the number of write data logical blocks exceeds the size of the segment being written into when the end of the segment is reached, the data is written into the beginning of the same cache segment, overwriting the data that was written there at the beginning of the operation. However, the drive does not overwrite data that has not yet been written to the medium.

Tables 11.3.2-1 through 11.3.2-4 show Mode default settings for the Hawk 1LP family drives.

5.7 Synchronized spindle operation

The synchronized spindles operation allows several drives operating from the same host to operate their spindles at the same synchronized rotational rate. Drives operating in a system in synchronized mode can increase the system capacity and transfer rate in a cost effective manner.

For Hawk 1LP models, the interface consists of a twisted pair cable that connects the drives in the synchronized system in a daisy-chain configuration as shown in Figure 5.7-1. For "NC" models, the reference index signal (SYNC) signal is on pin J1-37 of the 80-pin I/O connector. See Table 11.6.3-1c. Master/Slave operation is autoarbitrated by each drive after head load. Alternatively, each drive in the system can be configured by the host (using the Mode Select command Rigid Disc Drive Geometry page*) to operate in either the master or slave mode.

After loading heads, a drive autoarbitrates for occurences of the Reference Index Signal (REFIND+). If the drive detects no REFIND+ signal on the line, it assumes master status and begins generating the REFIND+ signal. This signal will not be visible on the line until the last drive has powered up, since any unpowered drive holds the line low.

Using Mode Select command, drives can be re-configured by the host to be master or slave any time after the last drive has powered up. The master provides the reference signal to which all other drives phase lock, including the master. The master can be a drive or the host computer. All the drives may be configured as slaves, allowing the host to provide the REFIND+ signal. All drives default to the synchronized mode when powered up, unless J6 pins 5 and 6 are jumpered.

Each drive can be configured (jumpered) for the non-synchronized mode in which it ignores any reference signal that might be present. The connection of the synchronized reference signal to the host is required only if the host is to provide the reference signal. If the host does not provide the reference signal, the host should not be connected.

__________ *SCSI Interface Product Manual P/N 77738479

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Bottom side of PCB

DLYIND+

Sync Interface

Master Sync

Source

Host

(or other drive)

SCSI Bus

System

Interface

Spindle Control

37 [2]

+5V

Drive 1

Spindle Control

37 [2]

+5V

Drive 2

Spindle Control

37 [2]

+5V

Drive n

REFIND +

[1]

Notes.

[1] Configuration Select Header (see Figure 10.1-1 and 10.2.1-1). [2] This connection is only available on ST31200NC and ST3620NC models.

Figure 5.7-1. Synchronized drive interconnect diagram

The servo/read-write LSI on the master drive provides the reference signal (REFIND+). It is a 90.18 Hz crystal generated signal. The signal is normally false/negated (nominal 0 V) and makes a transition to the true/asserted (nominal +5 V) level to indicate the reference position during the revolution period. The trailing (falling) edge of the reference signal is used by the master and the slave drives to phase lock their spindles. A maximum of 10 seconds is allowed for a slave to synchronize with the reference signal. The DLYIND+ signal (available on J7-6. See Figure 5.7-1) of each synchronized drive shall occur 85.2 usec +20 usec after the REFIND+ signal. The DLYIND+ signal (internal to drive) of each synchronized drive shall occur 85.2 usec ±20 usec after the REFIND+ signal. Figure 5.7-2 shows the characteristics of the reference signal.

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REFIND +

0.5 usec min. 500 usec max.

T = 0.0111 second (+/- 1.0% max); +/- 10 usec cycle to cycle variance;

Figure 5.7-2. Synchronized reference signal characteristics

SCSI Interface Factors

The Rotational Position Locking (RPL) field in byte 17 (bits 0 and 1) of the Rigid Disc Drive Geometry mode parameters page (page 04h) is used for enabling/disabling spindle synchronization mode*. If the target fails to achieve synchronization, it shall create a unit attention to all initiators. The sense key shall be set to UNIT ATTENTION and the additional sense code set to RPL STATUS CHANGE. However, in automatic arbitration mode, UNIT ATTENTION and the RPL STATUS CHANGE is not set.

If subsequent to achieving synchronization the target detects a change of synchronization:

1) and, if the logical unit is not presently executing an I/O process for the initiator, the target shall create a unit

attention condition. The sense key shall be set to UNIT ATTENTION and the additional sense code set

to RPL STATUS CHANGE.

2) and, if the logical unit is presently executing an I/O process and no other error occurs, the target shall return

CHECK CONDITION status. The sense key shall be set to RECOVERED ERROR if the target is able to

complete the I/O process or HARDWARE ERROR if the target is unable to complete the I/O process. The

additional sense code is set to RPL STATUS CHANGE. The drive may be operated with a rotational skew when synchronized. The rotational skew is applied in the

retarded direction (lagging the synchronized spindle master control). A rotational offset of up to 255/256 of a revolution lagging may be selected. The amount of offset is selected by using the Mode Select command, Rigid Disc Drive Geometry page (page 04), byte 18*. The value in byte 18 (0 - FFh) is the numerator of a fractional multiplier that has 256 as the denominator. For example, 40h selects 40h/FFh or 1/4 of a revolution lagging skew, 80h selects 1/2 revolution lagging skew and etc. Since the drive supports all offset values from 0 to 255, values sent by the initiator are not rounded off. The drive translation of the digital offset values to physical rotational offsets will result in offset values whose phase error lies within the + or - 20 usec phase error with respect to the supplied 90.18 Hz reference signal.

The drive does not have the capability to adjust the rotational offset value requested by the initiator to a physical offset in the drive that corresponds in any way to sector boundaries or changes in ZBR zones. Such correspondences or changes, if required, must be formulated by the initiator in order for it to calculate the value of offset it sends to the drive.

__________ *SCSI Interface Product Manual P/N 77738479.

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6.0 Reliability specifications

The following reliability specifications assume correct host/drive operational interface, including all interface timings, power supply voltages, and environmental requirements.

Seek Errors Less than 1 in 107 seeks Read Error Rates [1]

Unrecovered Data Less than 1 sector in 1014 bits transferred

Miscorrected Data Less than 1 sector in 1021 bits transferred MTBF 500,000 hours Service Life 5 years Preventive Maintenance None required

Note.

[1] Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.

6.1 Error rates

The error rates stated in this specification assume the following: a. The drive is operated per this specification using DC Power as defined in this Manual (see Section 7.2).

b. The drive has been formatted with the SCSI FORMAT commands. c. Errors caused by media defects or host system failures are excluded from error rate computations. Refer

to Paragraph 8.0, Media Characteristics.

6.1.1 Read errors

Before determination or measurement of read error rates: a. The data that is to be used for measurement of read error rates must be verified as being written correctly

on the media.

b. All media defect induced errors must be excluded from error rate calculations.

6.1.2 Environmental interference

When evaluating systems operation under conditions of Electromagnetic Interference (EMI), the performance of the drive within the system shall be considered acceptable if the drive does not generate an unrecoverable condition.

An unrecoverable error, or condition, is defined as one that:

1. Is not detected and corrected by the drive itself;

2. Is not capable of being detected from the error or fault status provided through the drive or SCSI interface;

3. Is not capable of being recovered by normal drive or system recovery procedures without operator

intervention.

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6.1.3 Write errors

Write errors can occur as a result of media defects, environmental interference, or equipment malfunction. Therefore, write errors are not predictable as a function of the number of bits passed.

If an unrecoverable write error occurs because of an equipment malfunction in the drive, the error is classified as a failure affecting MTBF. Unrecoverable write errors are those which cannot be corrected within two attempts at writing the record with a read verify after each attempt (excluding media defects).

6.1.4 Seek errors

A seek error is defined as a failure of the drive to position the heads to the addressed track. There shall be no more than one recoverable seek error in 107 physical seek operations. After detecting an initial seek error, the drive automatically reseeks to the addressed track up to 3 times. If a reseek is successful, the Extended Sense reports a seek positioning error (15h), no seek complete error (02h), or track follow error (09h), and the sense key reports a recovered error (1h). If all three reseeks fail, a seek positioning error (15h) is reported with a Medium (3h) or Hardware error (4h) reported in the Sense Key. This is an unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculations. Ref. section 5.1.1.2 of SCSI-2 Interface Product Manual P/N 77738479.

6.2 Reliability and service

6.2.1 Mean time between failure

The production disc drive shall achieve an MTBF of 500,000 hours when operated in a benign atmosphere at an average disc drive ambient temperature of 95°F (35°C) or less as measured per this Product Manual, paragraph 7.4.1. Short term excursions up to the specification limits of the operating environment will not affect MTBF performance.

The following expression defines MTBF:

Estimated power-on operating hours in the period

MTBF per measurement period =

Number of drive failures in the period

Estimated power-on operation hours means power-up hours per disc drive times the total number of disc drives in service. Each disc drive shall have accumulated at least nine months of operation. Data shall be calculated on a rolling average base for a minimum period of six months.

Drive failure means any stoppage or substandard performance caused by drive malfunction.

6.2.2 Preventive maintenance

No routine scheduled preventive maintenance shall be required.

6.2.3 Service life

The drive shall have a useful service life of five years. Depot repair or replacement of major parts is permitted during the lifetime (6.2.4).

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6.2.4 Service philosophy

Special equipment is required to repair the drive HDA. In order to achieve the above service life, repairs must be performed only at a properly equipped and staffed service and repair facility. Troubleshooting and repair of PCBs in the field is not recommended, because of the extensive diagnostic equipment required for effective servicing. Also, there are no spare parts available for this drive. Drive warranty is voided if the HDA is opened.

6.2.5 Installation

The drive is designed, manufactured, and tested with a “Plug in and Play” installation philosophy. This philosophy minimizes the requirements for highly trained personnel to integrate the drive into the OEM’s system, whether in a factory or field environment.

The drive has been low level formatted at the factory and need not be reformatted.

6.2.6 Service tools

No special tools are required for site installation or recommended for site maintenance. Refer to Paragraph

6.2.4. The depot repair philosophy of the drive precludes the necessity for special tools. Field repair of the drive is not practical since there are no user purchasable parts in the drive.

6.2.7 Product warranty

Beginning on the date of shipment to customer and continuing for a period of five years, Seagate warrants that each product (including components and sub-assemblies) or spare part that fails to function properly under normal use due to defect in materials on workmanship or due to nonconformance to the applicable specifications will be repaired or replaced, at Seagate’s option and at no charge to customer, if returned by customer at customer’s expense to Seagate’s designated facility in accordance with Seagate’s Warranty Procedure. Seagate will pay for transporting the repair or replacement item to customer. For more detailed warranty information refer to the Standard terms and conditions of Purchase for Seagate products.

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7.0 Physical/electrical specifications

7.1 AC power requirements: None

7.2 DC power requirements

The voltage and current requirements for a single drive are shown in the following table. Values indicated apply at the drive power connector. The single ended power requirements includes the internal disc drive SCSI I/O termination.

Table 7.2-1. DC power requirements

Single Ended Differential +5 V +12 V +5 V +12 V

Voltage Regulation [5] +5% +5% [2] +5% +5% [2]

Average Idle Current [1] [3] 0.45 A 0.37 A 0.45 0.37

Maximum Starting Current (Peak)[6] 0.65 A 1.9 A 0.65 1.90

Delayed Motor Start (Max) [4][6] 0.60 A 0.22 A 0.60 0.22

Operating Current [7]

Typ. [1] 0.73 A 0.57 A 0.73 0.57 Max. [1] 0.83 A 0.57 A 0.83 0.57 Max. (Peak) 1.0 A 1.9 A 1.0 1.90

[1] Measured with average reading DC ammeter. Instantaneous current peaks will exceed these values. [2] A droop of up to -10% is permissible during power up. The +5% must be maintained after the drive signifies

that its power up sequence has been completed and that the drive is able to accept selection by the Host

Initiator. [3] See +12 V current profile level T6 in Figure 7.2.2-1. [4] This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start

Motor command. [5] See paragraph 7.2.1 “Conducted Noise Immunity”. [6] Peaks of 0.90 A (nominal) on +12 V will occur for no more than 100 ms total during the first 250 ms after

power is applied. [7] Instantaneous peaks less than 5 msec. in duration are allowed.

General Notes from Table 7.2-1:

1. At powerup, the motor current regulator limits the 12 volt current to a peak value of less than 1.9

amperes, although instantaneous peaks may occur as stated in [7] above.

2. Operating condition is defined as random seek read of 64 blocks.

3. Minimum operating current loading for each supply voltage is not less than 38% of the maximum operating

current shown.

4. The +5 and +12 volt supplies shall employ separate ground returns.

5. Where power is provided to multiple drives from a common supply, careful consideration for individual drive

power requirements should be noted. Where multiple units are powered on simultaneously, the peak

starting current must be available to each device.

7.2.1 Conducted noise immunity

Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 mHz. Maximum allowed noise values given below are peak to peak measurements and apply at the drive power connector. +5 V = 150 mV pp from 0 to 100 kHz and 45 mA pp from 100 kHz to 10 mHz. +12 V = 150 mV pp from 0 to 100 kHz and 60 mA pp from 100 kHz to 10 mHz.

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7.2.2 Power sequencing

The drive does not require power sequencing. The drive protects against inadvertent writing during power up and down. Daisy-chain operation requires that power be maintained on the terminated drive to ensure proper termination of the peripheral I/O cables.

7.2.3 12 V - current profile

Figure 7.2.2-1 identifies the drive +5 V and +12 V current profile. The current during the various times is as shown:

T -Power is applied to the drive. T1 -Controller self tests are performed. T2 -Spindle begins to accelerate under current limiting after performing drive internal diagnostics. See Note

1 of Table 7.2-1. T3 -The spindle is up to speed and the Head-Arm restraint is unlocked. T4 -The heads move from the landing zone to the data area. T5 -The adaptive calibration sequence is performed. T6 -Calibration is complete and the drive is ready for reading and writing.

Note. All times and currents are typical. See Table 7.2-1 for maximum current

requirements.

12V

Current

(amps)

CHANNEL 2 GND

5V

Current

(amps)

CHANNEL 1 GND

Figure 7.2.2-1. Typical Hawk 1LP family drive +5 V and +12 V current profile

02468101214 18

0246810

Seconds

12 14 16 18



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7.3 Heat/power dissipation

For drives with single ended interface circuits, typical operating random read power dissipation is 8.5 watts (29 BTUs per hour) of DC power average at nominal voltages. Typical power dissipation under idle conditions is

6.5 watts (22.2 BTUs per hour).

7.4 Environmental limits

Temperature and humidity values experienced by the drive must be such that condensation does not occur on any drive part. Altitude and atmospheric pressure specifications are referenced to a standard day at 58.7°F (14.8°C). Maximum Wet Bulb temperature is 82°F (28°C).

7.4.1 Temperature

a. Operating

The drive meets all specifications over a 41°F to 122°F (5°C to 50°C) drive ambient temperature range with

a maximum gradient of 36°F (20°C) per hour. The enclosure for the drive should be designed such that

the temperatures at the locations specified in Table 7.4.1-1, column 1 are not exceeded. Air flow may be

needed to achieve these temperature values. Operation at case temperatures above these values may

adversely affect the drive's ability to meet specifications.

The MTBF specification for the drive is based on operating at an ambient temperature of 95°F (35°C).

Occasional excursions to drive ambient temperatures of 50°C or 5°C may occur without impact to

specified MTBF. To achieve the specified MTBF, the values of Table 7.4.1-1 Column 2 must be considered

maximum average operating case temperatures. Continual or sustained operation at case temperatures

above the values shown in Column 2 may degrade MTBF.

Table 7.4.1-1. PCB and HDA temperatures

Items Column 1 Column 2 in Maximum Case Typical Case Figure Temperatures (°C) Temperatures(°C)

7.4.1-1 Operating (50° Ambient) [3] at 35°C Ambient [1]

HDA 60 [2] 56 U2 80 72 U8 65 50 Q2 64 63 Q13 67 61

[1] The temperatures in Column 2 were made in an enclosed box with no air flow at a pressure of one

atmosphere. [2] No point on the HDA top cover should exceed the maximum temperature. Measure at a point shown in

Figure 7.4.1-1. [3] Ambient temperature measured at the side of the drive 0.25" (6.4 mm) from the case. Air flow is 3.5 cfm,

min. b. Non-Operating

-40° to 158°F (-40° to 70°C) package ambient with a maximum gradient of 45°F (25°C) per hour. This

specification assumes that the drive is packaged in the shipping container designed by Seagate for use

with drive.

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Model ST31200N PCB

U17

U16

U15

U2Ø

U18

U19

U11

U1Ø

Model ST31200NC PCB

U17

U16

U15

U2Ø

U11

U10

HDA

Q13

Model ST31200ND PCB

U17

U2Ø

U18

U19

U16

U15

U1Ø

SEAGATE

U11

Q13

U13

Bottom side of PCB

Figure 7.4.1-1. Locations of components listed in table 7.4.1-1.

7.4.2 Relative humidity

The values below assume that no condensation on the drive occurs. a. Operating

8% to 80% relative humidity with a maximum gradient of 10% per hour. b. Non-Operating

5% to 95% relative humidity.

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7.4.3 Effective altitude (sea level reference)

a. Operating

-1000 to +10,000 feet (-305 to +3048 metres)

b. Non-Operating

-1000 to +40,000 feet (-305 to +12,210 metres)

7.4.4 Shock and vibration

Shock and vibration limits specified in this document are measured directly on the drive chassis. If the drive is installed in an enclosure to which the stated shock and/or vibration criteria is applied, resonance’s may occur internally to the enclosure resulting in drive movement in excess of the stated limits. If this situation is apparent, it may be necessary to modify the enclosure to minimize drive movement.

The limits of shock and vibration defined within this document are specified with the drive mounted by any of the four methods shown in Figure 7.4.4-1. Orientation of the side nearest the LED may be up or down, though the figure shows it down.

7.4.4.1 Shock

a. Operating

The drive, as installed for normal operation, shall operate error free while subjected to intermittent shock

not exceeding 10 g’s at a maximum duration of 11 ms (half sinewave). Shock may be applied in the X, Y,

or Z axis. b. Nonoperating

The limits of nonoperating shock shall apply to all conditions of handling and transportation. This includes

both isolated drives and integrated drives.

The drive subjected to nonrepetitive shock not exceeding 75 g’s at a maximum duration of 11 ms (half

sinewave) shall not exhibit device damage or performance degradation. Shock may be applied in the X,

Y, or Z axis. c. Packaged

The drive as packaged in a single or multiple drive pack of gross weight 20 pounds (8.95 kg) or less by

Seagate for general freight shipment shall withstand drop test from heights listed below against a concrete

floor or equivalent. For additional details refer to specifications 30190-001 (under 100 lbs) or 30191-001

(over 100 lbs).

Package Size Drop Height

600 - 1800 in3 (9,832 - 29,502 cm3) 48 in (121 cm) >1800 in3 (>29,502 cm3) 42 in (106 cm)

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SEAGATE

Figure 7.4.4-1. Recommended mounting

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7.4.4.2 Vibration

a. Operating

The drive as installed for normal operation, shall comply with the complete specified performance while

subjected to continuous vibration not exceeding

5-22 Hz @ 0.040 inches (1.03 mm) displacement 22-400 Hz @ 1.0 g

Vibration may be applied in the X, Y, or Z axis. b. Nonoperating

The limits of nonoperating vibration shall apply to all conditions of handling and transportation. This

includes both isolated drives and integrated drives.

The drive shall not incur physical damage or degraded performance as a result of continuous vibration not

exceeding

5-22 Hz @ 0.081 inches (2.05 mm) displacement 22-400 Hz @ 2.00 g

Vibration may be applied in the X, Y, or Z axis.

7.4.5 Air cleanliness

The drive is designed to operate in a typical office environment with minimal environmental control.

7.5 Electromagnetic compatibility

7.5.1 Electromagnetic susceptibility

As a component assembly, the drive is not required to meet any susceptibility performance requirements. It is the responsibility of the system integrator to perform those tests required to ensure that equipment operating in the same system as the drive does not adversely affect the performance of the drive. See section 6.1.2, and see Table 7.2-1, DC Power Requirements.

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7.6 Mechanical specifications

The following nominal dimensions are exclusive of the decorative front panel accessory. However, dimensions of the front panel are shown in figure below. Refer to Figure 7.6-1 for detailed mounting configuration dimensions. See section 7.6.3, Drive mounting.

Height: 1.00 in 25.4 mm Width: 4.00 in 101.6 mm Depth: 5.74 in 145.8 mm Weight: 1.5 pounds 0.68 kilograms

[4]

[3]

[1]

[2]

[4]

Notes:

[1] Mounting holes three on each side, 6-32 UNC. Max screw length into side of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of 0.12 in. (3.05 mm).

[2] Mounting holes four on bottom, 6-32 UNC. Max screw length into bottom of drive 0.20 in. (5.08 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of 0.12 in. (3.05 mm).

[3] Power and interface connectors can extend past the "A" dimension by 0.040 in. (1.02 mm).

[4] Decorative front panel.

A B C

D E F G

L M N

Inches

5.74

4.00

1.00

2.362 .620

4.000 .250

1.750

3.750

2.370

1.00

4.000

0.19

0.015

± .010 ± .010 + .026 – .010 ± .010 ± .010 ± .010 + .010 – .005 ± .010 ± .010 ± .010 ± .010 ± .010 ± .010 max

Millimeters

145.80

101.60

25.40

60.00

15.75

101.60

6.35

44.45

95.25

60.20

25.40

101.60

4.83

0.381

± .25 ± .25 + .66 – .25 ± .25 ± .25 ± .25 + .25 – .12 ± .25 ± .25 ± .25 ± .25 ± .25 ± .25 max

Figure 7.6-1a. Mounting configuration dimensions (50 pin SCSI and 4 pin DC power connectors)

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[3]

[1]

Pin 1

Connector Centerline

[2]

[5]

Notes:

[1] Mounting holes three on each side, 6-32 UNC. Max screw length into side of drive 0.15 in. (3.81 mm).

Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of 0.12 in. (3.05 mm).

[3] Power and interface connectors can extend past the "A" dimension by 0.020 in. (.51 mm).

[4] Connector is centered on drive within ±0.020 in. (.508 mm).

Inches

5.74

± .010

4.00

± .010

1.00

+ .026 – .010

2.362

± .010

.620

± .010

4.000

± .010

.250

+ .010 – .005

1.750

± .010

3.750

± .010

2.370

± .010

0.181

+ .018 – .013

Millimeters

145.80

101.60

25.40

60.00

15.75

101.60

6.35

44.45

95.25

60.20

4.597

± .25 ± .25 + .66 – .25 ± .25 ± .25 ± .25 + .25 – .12 ± .25 ± .25 ± .25 + .45 – .33

Figure 7.6-1b. Mounting configuration dimensions (80 pin I/O connector)

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7.6.1 Drive orientation

The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive performance characterization, however, has been done with the drive in horizontal (discs level) and vertical (drive on its side) orientations, and these are the two preferred mounting orientations.

7.6.2 Cooling

Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding the drive will not exceed temperature conditions specified in 7.4.1. Specific consideration should be given to make sure adequate air circulation is present around the PCBs to meet the requirements of 7.4.1.

7.6.3 Drive mounting

When mounting the drive using the bottom holes care must be taken to ensure that the drive is not physically distorted due to a stiff non-flat mounting surface. The allowable mounting surface stiffness is 80 lb/in (14.0 N/mm). The following equation and paragraph define the allowable mounting surface stiffness:

k * x = 80 lb (14.0 N)

where ‘k’ represents the mounting surface stiffness (units of lb/in or N/mm), and, ‘x’ represents the out-of-plane mounting surface distortion (units of inches or millimeters). The out-of-plane distortion (‘x’) is determined by defining a plane with three of the four mounting points fixed and evaluating the out-of-plane deflection of the fourth mounting point when a known force is applied to the fourth point.

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8.0 Media characteristics

8.1 Media description

The media used on the drive has a diameter of approximately 3.7 inches (95 mm). The aluminum substrate is coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability and environmental protection.

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9.0 Defect and error management

The drive, as delivered, complies with this specification. The read error rate and specified storage capacity are not dependent upon use of defect management routines by the host (initiator).

Defect and error management in the SCSI system involves the drive internal defect/error management and SCSI systems error considerations (errors in communications between Initiator and the drive). Tools for use in designing a defect/error management plan are briefly outlined in this section, with references to other sections where further details are given.

9.1 Drive internal defects/errors

Identified defects are recorded on the drive defects list tracks (referred to as the primary or ETF defect list). These known defects are reallocated during the initial drive format operation at the factory. (See Format Unit command Section 5.2.1.2 in SCSI Interface Product Manual P/N 77738479). Data correction by ECC can be applied to recover data from additional flaws if they occur.

Details of the SCSI commands supported by the drive are described in SCSI Product Interface Manual, P/N

77738479. Also, more information on the drive Error Recovery philosophy is presented in Section 6 of the SCSI Interface Product Manual.

9.2 SCSI systems error considerations

Information on the reporting of operational errors or faults across the interface is given in SCSI Interface Product Manual. Message Protocol System is described in the SCSI Interface Product Manual. Several of the messages are used in the SCSI systems error management system. The Request Sense command returns information to the host about numerous kinds of errors or faults. The Receive Diagnostic Results reports the results of diagnostic operations performed by the drive.

Status returned by the drive to the Initiator is described in the SCSI Interface Manual*. Status reporting plays a role in the SCSI systems error management and its use in that respect is described in sections where the various commands are discussed.

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10.0 Option/configuration headers

10.1 Drive ID/option select header

Figures 10.1-1 and 10.1-2 show a bottom view of the drive (PCB toward viewer) for the purpose of showing the drive ID select and configuration option select jumper connectors. The notes following the figures describe the functions of the various jumper positions on the 3 connectors J2, J5 and J6. Suggested part number for the jumpers for J2 is Molex 52747-0211 (Seagate P/N 77679052).

Side View of Drive

Pin 1

[2]

SCSI ID = 0

SCSI ID = 1

SCSI ID = 2

SCSI ID = 3

SCSI ID = 4

SCSI ID = 5

SCSI ID = 6

SCSI ID = 7

PCB part number 

label here.

A0A1A

HDA

SCSI ID = 0

SCSI ID = 1

SCSI ID = 2

SCSI ID = 3

SCSI ID = 4

SCSI ID = 5

SCSI ID = 6

SCSI ID = 7

Sync

Spindle

Remote

LED

Drive with HDA up,

PCB down,

viewed from front

HDA

A2A1A

Pin 1

S

L

S

E

3 4

SCSI I/O

Connector

DC Power Connector



P

T

Pin 1

[2]

 T P

[2]

Pin 1

 T P

Pin 1

End

Drive Front

R E S



R



Jumper

Positions



E

D

M

W

Reserved

Delay

Motor Start

Enable

Motor Start

Write Protect

Parity Option

Enable

Terminators

Term. Power

from Drive

Term. Power

to SCSI Bus

Term. Power

from SCSI Bus

[3]

[3] [3]

CATH

Position A

Figure 10.1-1. ID and option select header for Models ST31200N/ND and ST3620N

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Pin 1

End

SCSI ID = 0

SCSI ID = 1

SCSI ID = 2

SCSI ID = 3

SCSI ID = 4

SCSI ID = 5

SCSI ID = 6

SCSI ID = 7

Sync

Spindle

Remote

LED

Reserved

Drive with HDA up,

PCB down,

viewed from front

HDA

S

A2A1A

S P

3 4

Pin 1

L E D

Drive Front

80 Pin SCSI I/O  Connector

R E S

Positions

Jumper

R



E

D

M



W

P

T

Pin 1



 T P

Reserved

Delay

Motor Start

Enable

Motor Start

Write Protect

Parity Option

Enable

Terminators

Term. Power

from Drive

Not Used

CATH

Optional terminator module installed only at factory.

Only drives having terminators (U5 module) use TE and TP,

and these are installed only if needed.

Figure 10.1-2. ID and option select header for Models ST31200NC and ST3620NC

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Notes for Figure 10.1-1.

[1] Notes explaining the functions of the various jumpers on jumper header connectors J2, J5 and J6 are given

below in left to right order of jumper position. The term “default” means as standard OEM units are configured when shipped from factory. “Off” means no jumper is installed; “On” means a jumper is installed. Off or on underlined is factory default condition.

[2] The PCB on “NC” models does not have connector J5, and has a single 80 pin combined SCSI I/O and

DC power connector instead of the normal 50 pin SCSI I/O and 4 pin DC power connectors. Included among the 80 pins are the SCSI ID, Motor Start and Delayed Motor Start select functions, and the synchronous spindle master sync signal and the remote LED signals. Do not use J2 and J6 for these five functions if the host uses the ones included in the 80 pin connector. See Table 11.6.3-1c for a list of pin numbers vs. signals for the 80 pin connector.

[3] "ND" models do not have terminators on the drive PCB, so these jumpers are not applicable to these drives.

J2 Jumper Installation Jumper Function Description

RES

Off/On Reserved. Default is no jumper installed.

DS ME

Off Off Spindle starts immediately after power up - Default setting. Off On Drive spindle does not start until Start Unit command received from host. On Off Spindle Startup is delayed by SCSI ID times 12 seconds after power is applied, i.e., drive 0

spindle starts immediately when DC power connected, drive 1 starts after 12 second delay, drive 2 starts after 24 second delay, etc.

On On Drive spindle starts when Start Unit command received from host. Delayed start feature is

overridden and does not apply when ME jumper is installed.

On Entire drive is write protected. Off Drive is not write protected. Default is no WP jumper installed.

On Parity checking and parity error reporting by the drive is enabled. Default is PE jumper

installed.

Off Drive does not report result of parity checking to host.

On With the jumper installed, the On-board (non-removable) terminator circuits are enabled

(connected to the I/O lines). Default is jumper installed.

Off Terminator circuits not connected to I/O lines.

TP TP

Off Off No terminator power is connected to drive terminators or SCSI bus I/O pin 26. On Off Drive supplies its own teminator power only. On "NC" model drives, this jumper may be

required if terminator Module U5 is installed. See Figure 10.1-2. Jumper on this position is factory default for "N" model drives.

Off On Drive supplies power to I/O pin 26 of SCSI bus; none to internal terminators. When drives have

differential I/O circuits, a jumper on the right TP position may be needed to power external terminators (see system documentation). The ST31200ND drive has differential I/O circuits which have no terminator circuits on the drive. The model ST31200NC and ST3620NC may have terminators (U5) on the drive, but has no provisions for terminator power in the 80 pin I/O connector.

On On Drive supplies terminator power to itself (internal connection) and to I/O pin 26 of SCSI bus.

This is a legal jumper setting, but would only be used for "N" model drives.

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continued from previous page

TP Position A

On This horizontally positioned jumper across the two TP positions nearest PCB edge, connects

terminator power from SCSI bus I/O pin 26 to the drive’s internal terminators (for single-ended I/O only).

Off See above explanations for TP jumpers.

J5 Jumper Installation Jumper Function Description

A0,A1,A2* Drive ID on SCSI Bus (J6 may be used instead, as ID circuits on J5 and J6 are in parallel.

Use only one set for ID). The drive ID is binary coded positionwise i.e., jumper in position A2 is drive ID 4, in position A1 is ID 2, position A0 is ID 1 and no jumpers is ID 0. Default is ID = 0.

J6 Jumper Installation Jumper Function Description

A2,A1,A0* Drive ID on SCSI bus. Either J5 or J6 (optional) may be used to select drive ID. Both should

not be used at the same time, because at some future time when the ID is changed the user could fail to configure both J5 and J6 the same. Default is ID = 0.

SSP* Used only as a cable connection for the reference index signal (REFIND+) (J6 Pin 6, bottom)

for sync spindle feature. J6 pin 5 is GRD. See paragraphs 10.2, 5.7 for description of synchronized spindle operation. A jumper should be installed whenever no cable is connected. Default is jumper installed.

LED* No jumper ever installed. These pins used to connect a cable for a remote LED indicator. Pin

3 (top, nearest HDA), the anode connection, connects in the drive to the +5V supply through a pull-up resistor. Pin 4 (bottom), the cathode connection connects in the drive to signal common through the emitter-collector junction of a transistor switch that controls the LED on/

off condition. RES Reserved position. No jumper to be installed. * See note [2] above.

10.2 Synchronized spindles interface

The Synchronized Spindles Interface (SSI) allows several drives operating from the same host to operate their spindles at a synchronized rotational rate. Details of the electrical and physical interfaces follow in paragraphs

10.2.1 and 10.2.1.2 and 10.2.1.3. The system operation is described in paragraph 5.7. Drives to be synchronized should be the same make and model.

10.2.1 Electrical description

The electrical interface consists of one digital TTL reference index signal and ground. The reference index signal (REFIND+) is an output if the drive is configured as a master and is an input otherwise. The reference index signal is connected from drive to drive in a Daisy-chain fashion as shown in Figure 5.7-1.

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10.2.1.1 Drivers and receivers

Figure 10.2.1-1 shows a diagram of the driver/receiver circuit. The driver circuits have the following electrical specifications.

Negated (False): 0.0 V to +0.4 V @ I = - 48 mA (max).

Asserted (True): +2.24 V to +5.25 V @ I = +250 uA.

Main PCB

Driver Receiver

J1 - 37 [1] J6 - 6

+5V

2.0K Ohm

REFIND +

J6 - 5

GND

Note.

[1] This connection available only on the ST31200NC and ST3620NC models. Use one or the other, but not both J1

and J6.

Figure 10.2.1-1. SCSI reference index signal driver/receiver combination

10.2.1.2 Termination

The reference index signal (REFIND+) is terminated with a 2 K ohm resistor. Each drive has a termination resistor located on the Main PCB. The terminator resistor is not removable and is always in the circuit.

__________ *See paragraph 10.2.1.2

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10.2.1.3 Physical interface

The dimensions of the connector (J6) mounted on the Main PCB to interconnect the drives is shown in Figure

10.2.1-2. It is a 12 pin, 6 jumper position gold header type connector. Only pins 5 and 6 are used for connecting the Reference Index signal cable, as shown in Figure 10.2.1-2. Pin 6 is REFIND+ and Pin 5 is ground.

.485 Max.

.020 +/- .010

(square)

Main PCB

.157

+/- .010

.0787

Typ.

.394 +/- .010

Figure 10.2.1-2. Configuration select header specification (connector used has 12 pins)

.0787 Typ.

.157

+/- .010

10.3 Grounding

Signal ground (PCB) and HDA ground are connected together in the ST31200 drive and cannot be separated by the user. The equipment in which the drive is mounted is connected directly to the HDA and PCB with no electrically isolating shock mounts. If it is desired for the system chassis to not be connected to the HDA/PCB ground, the systems integrator or user must provide a nonconductive (electrically isolating) method of mounting the drive in the host equipment.

The interface physical characteristics for the “NC” models are given in Figure 11.6.3-1b and in Table 11.6.31c. The REFIND+ signal (called “SYNC”) is included among the 80 pins of the I/O connector.

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11.0 Interface requirements

11.1 General description

This section partially describes the interface requirements as implemented on the drives. The major portion of the interface requirements/implementation is described in the Seagate SCSI Interface Product Manual, P/N 77738479. This section has tables that give the Hawk 1LP Family drives version of the SCSI implementation described in the 77738479 document.

11.2 SCSI interface messages supported

Table 11.2-1 following lists the messages supported by the SCSI-1, SCSI-2 and SCSI-3 modes of the ST31200N/ND Family drives.

Table 11.2-1. SCSI messages supported by ST31200N/ND/NC family drives

Msg Supported by: Code SCSI-1 SCSI-2/SCSI-3 Message Name

01h[1] Y Y Extended Messages 06h Y Y Abort 0Dh Y Y Abort-tag 0Ch Y Y Bus device reset 0Eh Y Y Clear queue 00h Y Y Command complete 12h Y Y Continued I/O process 04h Y Y Disconnect 80h-FFh Y Y Identify 23h N N Ignore wide residue (two bytes) 0Fh N N Initiate recovery 05h Y Y Initiator detected error 0Ah N N Linked command complete [2] 0Bh N N Linked command complete with flag [2] 09h Y Y Message parity error 07h Y Y Message reject [1] N N Modify data pointer 08h Y Y No operation

Queue tag messages (two bytes) 21h Y Y Head of queue tag 22h Y Y Ordered queue tag 20h Y Y Simple queue tag 10h Y N Release recovery 03h Y Y Restore pointers 02h Y Y Save data pointer [1] Y Y Synchronous data transfer req. 13h Y Y Target transfer disable 11h N N Terminate I/O process [1] N N Wide data transfer request

Notes.

[1] Extended messages (see P/N 77738479 SCSI Interface Product Manual). [2] Customer Unique.

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11.3 SCSI interface commands supported

Table 11.3-1 following lists the SCSI interface commands that are supported in the SCSI-1, SCSI-2 and SCSI-3 modes of the drive. Hawk 1LP Family drives can be changed back and forth between SCSI-1, SCSI-2/SCSI-3 modes using the Change Definition Command. OEM standard drives are shipped set to operate in SCSI-2/SCSI-3 mode.

Table 11.3-1. Commands supported by Hawk 1LP family drives

Com’d Supported by: Code SCSI-1 SCSI-2/SCSI-3 Command Name

00h Y Y Test unit ready 01h Y Y Rezero unit 03h Y Y Request sense

Y Y Extended sense Y Y Field pointer bytes Y Y Actual retry count bytes

Y Y Deferred error supported 04h Y Y Format unit [1] 07h Y Y Reassign blocks 08h Y Y Read 0Ah Y Y Write 0Bh Y Y Seek 12h Y Y Inquiry

Y Y Vital product data page

Y Y Unit serial number page

Y Y Implemented operating def page

Y Y Firmware numbers page

Y Y Date code page

Y Y Jumper settings page 15h Y Y Mode select (same pages as Mode

Sense command, see below)

16h Y Y Reserve

Y Y 3rd party reserve

N N Extent reservation 17h Y Y Release 18h N N Copy 1Ah Y Y Mode sense

Y Y Unit attention page (00h)

Y Y Byte 2 bit 4 (unit attn bit)

Y Y Byte 2 bit 5 (DEID bit)

Y Y Error recovery page (01h)

Y Y Disconnect/reconnect (02h)

Y Y Format page (03h)

Y Y Rigid disc drive geometry page (04h)

N Y Verify error recovery page (07h)

N Y Caching parameters page (08h)

N Y Control mode page (0Ah)

N Y Notch and Partition Page (0C) [1] The Hawk 1LP family can format to any even number of bytes per sector from 180 to 4096.

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continued from previous page

Com’d’ Supported by: Code SCSI-1 SCSI-2/SCSI-3 Command Name

1Bh Y Y Start unit/stop unit (spindle ceases rotating) 1Ch Y Y Receive diagnostic results

Y Y Supported diagnostics pages

Y Y Translate page 1Dh Y Y Send diagnostics page

Y Y Supported diagnostics pages

Y Y Translate page 25h Y Y Read capacity 28h Y Y Read extended 2Ah Y Y Write extended 2Bh Y Y Seek extended 2Eh Y Y Write and verify 2Fh Y Y Verify 30h N N Search data high 31h N N Search data equal 32h N N Search data low 33h N N Set limits 34h N N Pre-fetch 35h Y Y Synchronize cache 36h N N Lock-unlock cache 37h Y Y Read defect data 39h N N Compare 3Ah N N Copy and verify 3Bh Y Y Write buffer 3Ch Y Y Read buffer 3Eh Y Y Read long 3Fh Y Y Write long 40h Y Y Change definition 41h N N Write same 42-4Bh N N Not used 4Ch Y Y Log select 4Dh Y Y Log sense 4E-54h N N Not used 55h Y Y Mode select (10) 56h N Y Reserve (10) 57h N Y Release (10) 58-59h N N Not used 5Ah Y Y Mode sense (10) 5B-5Fh N N Not used 60-BFh N N Not used C0-DFh N N Not used E0-FFh N N Not used

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11.3.1 Inquiry data

11.3.1.1 Standard Inquiry data

Table 11.3.1-1 following lists the Standard Inquiry command data that the drive should return to the initiator per the format given in the SCSI-2 Interface Product Manual P/N 77738479, section 5.1.1.3.

Table 11.3.1-1. ST31200N/ND/NC family drive Standard Inquiry data

Bytes Data (Hex)

0-15 00 00 ** *** 8F 00 00 12 53 45 41 47 41 54 45 20 VENDOR ID 16-31 53 54 [33][31][32][30][30][4E][20] 20 20 20 20 20 20 20 PRODUCT ID 32-47 R# R# R# R# S# S# S# S# S# S# S# S# 00 00 00 00 48-63 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 64-79 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80-95 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 96-111 00 43 6F 70 79 72 69 67 68 74 20 28 63 29 20 31* *COPYRIGHT 112-127 39* 39* 33* 20 53 65 61 67 61 74 65 20 41 6C 6C 20 NOTICE 128-143 72 69 67 68 74 73 20 72 65 73 65 72 76 65 64 20 144-148 D# D# D# D#

*Copyright Year - changes with actual year.

Notes.

** 01 means SCSI-1 implemented;

02 means SCSI-2 implemented. Hawk 1LP Family drives can be changed between these two configurations. Default is 02.

*** 01 means response data is in SCSI-1 format and has compatibility with Common Command Set data.

02 means response data is in SCSI-2 format. The drive can be changed between these two configurations. Default is 02.

R# Four ASCII digits representing the last four digits of the product Firmware Release number. This

information is also given in the Vital Product data page C0h, together with servo RAM and ROM release

numbers. S# Eight ASCII digits representing the eight digits of the product serial number. D# Four ASCII digits representing the firmware distribution diskette serial number. [ ] Bytes 18 through 24 will reflect model of drive. Shown here are hex values for Model ST31200N.

For model ST31200ND byte 24 is 44 (D). for model ST31200NC byte 24 is 43 (C).

11.3.1.2 Inquiry Vital Product data

Instead of the standard Inquiry data shown in Table 11.3.1-1, the initiator can request several Vital Product Data pages by setting the Inquiry command EVPD bit to one. The SCSI-2, Version 2 Interface Product Manual P/N 77738479, section 5.1.1.3.1 lists the Vital Product Data pages supported and describes their formats. A separate Inquiry command must be sent to the drive for each Vital Product Data page the initiator wants the drive to send back.

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11.3.2 Mode Sense data Mode Sense command provides a means for the drive to report its operating parameters to the initiator. The

drive maintains four sets of Mode parameters, Default values, Saved values, Current values and Changeable values.

Default values are hard coded in the drive firmware that is stored in flash E-PROM nonvolatile memory on the drive PCB. Default values can be changed only by downloading a complete set of new firmware into the flash E-PROM. An initiator can request and receive from the drive a list of Default values and use those in a Mode Select command to set up new Current and Saved values.

Saved values are stored on the disk media using a Mode Select command. Only parameter values that are allowed to be changed can be changed by this method. See “Changeable values” defined below. Parameters in the Saved values list that are not changeable by the Mode Select command get their values from the Default values storage.

Current values are volatile values currently being used by the drive to control its operation. A Mode Select command can be used to change these values (only those that are changeable). Originally, they are installed from Saved or Default values after a power on reset, hard reset, or Bus Device Reset message.

Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the Current values and Saved values can be changed by a Mode Select command. A “one” allows a change to a corresponding bit; a “zero” allows no change. For example, in Table 11.3.2-1 refer to Mode page 01, in the first row entitled “CHG”. These are hex numbers representing the changeable values for Mode page 01. Note in columns 1 and 2 (bytes 00 and 01), there is 00h, which indicates that in bytes 00 and 01 none of the bits are changeable. Note also that bytes 04, 05, 06 and 07 are not changeable, because those fields are all zeros. In bytes 02, hex value FF equates to the binary pattern 1111 1111. If there were a zero in any bit position in the field, it would mean that bit is not changeable. However, bits 7 - 0 are changeable, because those bits are all ones. In this particular case, it indicates 8 error recovery control bits are all changeable. FF in column 4 indicates all bits in byte 3 are changeable.

The Changeable values list can only be changed by downloading new firmware into the flash E-PROM. On drives requiring unique Saved values, the required unique Saved values are stored into the Saved values

storage location on the media prior to shipping the drive. Some drives may have unique firmware with unique Default values also.

On standard OEM drives the Saved values are taken from the Default values list and stored into the Saved values storage location on the media prior to shipping.

When a drive is powered up, it takes Saved values from the media and stores them to the Current values storage in volatile memory. It is not possible to change the Current values (or the saved values) with a Mode Select command before the drive is up to speed and is “ready.” An attempt to do so results in a “Check Condition” status being returned.

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The following tables list the values of the data bytes returned by the drive in response to the Mode Sense command pages for SCSI-1 and SCSI-2 implementation (see SCSI Interface Product Manual, P/N 77738479).

Definitions:

DEF = Default value. Standard drives are shipped configured this way. CHG = Changeable bits; indicates if current and saved values are changeable.

Table 11.3.2-1. Mode sense data, ST31200N/ND/NC default values (SCSI-1 implementation)

Bytes 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Mode Sense 63 00 00 08 Data 00 00 00 00 00 00 02 00

Mode MODE PAGE HEADERS AND PARAMETER DATA BYTES Page

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23

DEF

01 81 06 00 21 30 00 00 FF

CHG

01 00 00 FF FF 00 00 00 00

DEF

02 82 0A 80 80 00 0A 00 00 00 00 00 00

CHG

02 00 00 FF FF 00 00 00 00 00 00 00 00

DEF

03 83 16 00 09 00 09 00 00 00 12 00 55 02 00 00 01 00 0D 00 17 40 00 00 00

CHG

03 00 00 FF FF FF FF 00 00 FF FF 00 00 00 00 FF FF 00 00 00 00 00 00 00 00

DEF

04 84 12 00 0A 8C 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00

CHG

04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 FF 00

DEF

08 88 12 10 00 FF FF 00 00 FF FF FF FF 80 03 00 00 00 00 00 00

CHG

08 00 00 BD 00 FF FF FF FF FF FF 00 00 A0 FF FF FF 00 00 00 00

DEF

00 80 02 00 00

CHG

00 00 00 36 00

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44 Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. A _____________________________________________________________________________________

Table 11.3.2-2. Mode sense data, ST31200N/ND/NC default values (SCSI-2 implementation)

Bytes 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Mode 9F 00 00 08

Sense00 00 00 00 00 00 02 00 Data

Mode MODE PAGE HEADERS AND PARAMETER DATA BYTES Page

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23

DEF

01 81 0A 00 21 30 00 00 00 16 00 FF FF

CHG

01 00 00 EF FF 00 00 00 00 FF 00 00 00

DEF

02 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00

CHG

02 00 00 FF FF 00 00 00 00 00 00 00 00 80 00 00 00

DEF

03 83 16 00 09 00 09 00 00 00 12 00 55 02 00 00 01 00 0D 00 17 40 00 00 00

CHG

03 00 00 FF FF FF FF 00 00 FF FF 00 00 00 00 FF FF 00 00 00 00 00 00 00 00

DEF

04 84 16 00 0A 8C 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 15 23 00 00

CHG

04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 FF 00 00 00 00 00

DEF

07 87 0A 00 21 30 00 00 00 00 00 FF FF

CHG

07 00 00 0F FF 00 00 00 00 00 00 00 00

DEF

08 88 12 10 00 FF FF 00 00 FF FF FF FF 80 03 00 00 00 00 00 00

CHG

08 00 00 BD 00 FF FF FF FF FF FF 00 00 A0 FF FF FF 00 00 00 00

DEF

0A 8A 0A 00 10 00 00 00 00 00 00 00 00

CHG

0A 00 00 01 01 00 00 00 00 00 00 00 00

DEF

0C 8C 16 80 00 00 17 00 00 00 00 00 00 00 0A 89 08 00 00 00 00 00 00 10 00

CHG

0C 00 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

DEF

00 80 02 00 00

CHG

00 00 00 36 00

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Table 11.3.2-3. Mode sense data, ST3620N/NC default values (SCSI-1 implementation)

Bytes 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Mode Sense 63 00 00 08 Data 00 00 00 00 00 00 02 00

Mode MODE PAGE HEADERS AND PARAMETER DATA BYTES Page

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23

DEF

01 81 06 00 21 30 00 00 FF

CHG

01 00 00 FF FF 00 00 00 00

DEF

02 82 0A 80 80 00 0A 00 00 00 00 00 00

CHG

02 00 00 FF FF 00 00 00 00 00 00 00 00

DEF

03 83 16 00 05 00 05 00 00 00 0A 00 50 02 00 00 01 00 0C 00 15 40 00 00 00

CHG

03 00 00 FF FF FF FF 00 00 FF FF 00 00 00 00 FF FF 00 00 00 00 00 00 00 00

DEF

04 84 12 00 0A 8C 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00

CHG

04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 FF 00

DEF

08 88 12 10 00 FF FF 00 00 FF FF FF FF 80 03 00 00 00 00 00 00

CHG

08 00 00 BD 00 FF FF FF FF FF FF 00 00 A0 FF FF FF 00 00 00 00

DEF

00 80 02 00 00

CHG

00 00 00 36 00

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46 Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. A _____________________________________________________________________________________

Table 11.3.2-4. Mode sense data, ST3620N/NC default values (SCSI-2 implementation)

Bytes 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Mode 9F 00 00 08

Sense00 00 00 00 00 00 02 00 Data

Mode MODE PAGE HEADERS AND PARAMETER DATA BYTES Page

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23

DEF

01 81 0A 00 21 30 00 00 00 16 00 FF FF

CHG

01 00 00 EF FF 00 00 00 00 FF 00 00 00

DEF

02 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00

CHG

02 00 00 FF FF 00 00 00 00 00 00 00 00 80 00 00 00

DEF

03 83 16 00 05 00 05 00 00 00 0A 00 50 02 00 00 01 00 0C 00 15 40 00 00 00

CHG

03 00 00 FF FF FF FF 00 00 FF FF 00 00 00 00 FF FF 00 00 00 00 00 00 00 00

DEF

04 84 16 00 0A 8C 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 15 23 00 00

CHG

04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 FF 00 00 00 00 00

DEF

07 87 0A 00 21 30 00 00 00 00 00 FF FF

CHG

07 00 00 0F FF 00 00 00 00 00 00 00 00

DEF

08 88 12 10 00 FF FF 00 00 FF FF FF FF 80 03 00 00 00 00 00 00

CHG

08 00 00 BD 00 FF FF FF FF FF FF 00 00 A0 FF FF FF 00 00 00 00

DEF

0A 8A 0A 00 10 00 00 00 00 00 00 00 00

CHG

0A 00 00 01 01 00 00 00 00 00 00 00 00

DEF

0C 8C 16 80 00 00 17 00 00 00 00 00 00 00 0A 89 04 00 00 00 00 00 00 10 00

CHG

0C 00 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

DEF

00 80 02 00 00

CHG

00 00 00 36 00

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11.4 SCSI bus conditions and miscellaneous features supported

Asynchronous SCSI bus conditions supported by the drive are listed in Table 11.4-1. These conditions cause the SCSI device to perform certain actions and can alter the phase sequence. Other miscellaneous operating features supported are also listed here.

Table 11.4-1. SCSI bus conditions and other misc. features

Condition/Feature Supported by:

SCSI-1 SCSI-2 Conditions or Feature

Y Y Attention Condition Y Y Reset Condition Y Y Contingent Allegiance Condition N N Asynchronous Event Notification Y Y Arbitrating System Y Y Disconnect/Reconnect Y Y Asynchronous Data Transfer Y Y Synchronous Data Transfer Y Y Synchronized (locked) Spindle Operation Y Y Differential Interface Circuits available Y Y Segmented Caching N N Zero Latency Read Y Y Queue tagging (up to 64 Que tags supported) Y Y Deferred Error Handling Y Y Parameter Rounding Y Y Reporting actual retry count in Extended Sense bytes

15, 16 and 17. [1] [1] Adaptive Caching (available only on some drives) Y Y SMP = 1 in Mode Select command needed to save

RPL and Rotational Offset bytes (in Table 5.2.1-25

of Vol. II). [1] [1] Flag and Link bits in Control Byte supported Y Y Immediate status on Start/Stop command N N Immediate status on Format unit and Synchronize cache

commands

N N Format progress indication

SCSI-1 SCSI-2 Status Supported

Y Y Good Y Y Check Condition N N Condition Met/Good Y Y Busy [1] [1] Intermediate/Good N N Intermediate/Condition Met/Good Y Y Reservation Conflict Y Y Queue Full

Notes.

[1] Option supported only if customer requests.

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11.5 Synchronous data transfer

11.5.1 Synchronous data transfer periods supported

Table 11.5-1 and 11.5-2 list Synchronous Data transfer periods supported by the drive. The data transfer period to be used by the drive and the initiator is established by an exchange of messages during the Message Phase of operation. See the section on message protocol in the SCSI Interface manual*.

Table 11.5-1. Synchronous data transfer periods for drive

M (Decimal) Transfer period (M times 4 nanoseconds)

25 100 31 125 37 150 50 200 62 250 75 300 87 350 100 400 112 450 125 500 137 550 150 600 162 650 175 700 187 750 200 800

11.5.2 REQ/ACK offset

The maximum value supported by the Hawk 1LP Family drives for REQ/ACK offset is 15 (0Fh).

11.6 Physical interface

Figure 11.6-1 shows the locations of the physical interface components for the ST31200N/ND drives. Shown are the locations of the D.C. power connector, the SCSI interface connector, and the drive select and option select header.

An optional version of this drive, the models ST31200NC and ST3620NC, has an 80 pin connector that has the SCSI I/O signals and the DC power all together in the 80 pin I/O connector. See Figure 11.6.3-1b and Table

11.6.3-1c. Details of the physical, electrical and logical characteristics are given in paragraphs following, while the SCSI

operational aspects of Seagate drive interfaces are given in the Seagate SCSI Interface Product Manual, P/N 77738479.

__________ *SCSI Interface Product Manual, P/N 77738479

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SCSI I/O Connector

Pin 1

Pin

1 2 3 4

Power

+12V +12V ret + 5V ret + 5V

4321

DC Power Connector

Figure 11.6-1a. ST31200N/ND and ST3620N drives physical interface (50 pin SCSI I/O connector)

80 Pin SCSI I/O 

and Power

Connector

Pin 1

U5

Terminator

Module

Figure 11.6-1b. ST31200NC and ST3620NC drives physical interface (80 pin SCSI I/O and DC power connector)

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11.6.1 DC cable and connector

For models ST31200N/ND and ST3620N, the drive receives DC power through a 4 pin connector (see Figure

11.6-1a for pin assignment) mounted at the rear of the main PCB. Recommended part numbers of the mating connector are listed below, but equivalent parts may be used (see Table 11.6-1).

Table 11.6.1-1. Mating connector parts

Type of Cable Connector Contacts (20-14 AWG)

14 AWG MP 1-480424-0 AMP 60619-4 (Loose Piece)

AMP 61117-4 (Strip)

For models ST31200NC and ST3620NC, the DC power is routed with the SCSI bus signals through the 80 pin I/O connector. See Table 11.6.3-1c for power pin assignments.

11.6.2 Physical characteristics

This section defines the connectors, cables, signals, terminators and bus timing needed to implement SCSI.

11.6.2.1 Physical description

The "N" and "ND model drives may be daisy-chained together or with other compatible SCSI devices using a common cable. Both ends of the cable must be terminated. The model ST31200N/NC and ST3620N/NC drives implement single ended drivers and receivers. The model ST31200ND drive implements differential drivers and receivers. All signals are common between all SCSI devices. The drive may be daisy-chained only with SCSI devices having the same type drivers and receivers. Devices having single ended interface circuits cannot be on the same Daisy-chain with devices having differential interface circuit. A maximum of 8 SCSI devices (including the Host) may be daisy-chained together. The SCSI Devices at both ends of the Daisy-chain are to be terminated. Intermediate SCSI devices shall not be terminated (see Figure 11.6.3-2). Remove the terminator enable jumper TE on J2 select header, not the terminator power source selector jumper TP (Figure

10.1-1). "NC" model drives plug into PCB or bulkhead connectors in the Host. They may be connected in a daisy-chain

by the host backplane wiring or PCB circuit runs that have adequate DC current carrying capacity to support the number of drives plugged into the PCB or bulkhead connectors. A single 80 pin I/O connector cannot support the DC current needs of several drives, so NO DAISY-CHAIN CABLES should be used. A single drive connected via a cable to a host 80 pin I/O connector is not recommended.

11.6.2.2 Cable requirements ("N" and "ND" models only)

11.6.2.2.1 Single ended I/O circuits ("N" models)

The maximum total cable length for use with drives having single ended I/O driver and receiver circuits shall be 6 metres (19.7 ft.) when operating at line data transfer rates of 5 Mbytes/sec or less, and 3 metres (9.85 ft.) when operating at transfer rates greater than 5 Mbytes/sec (FAST SCSI). A stub length of no more than

0.1 metre (0.33 ft.) is allowed off the mainline interconnection with any connected equipment. An ideal impedance match with cable terminators implies a cable characteristic impedance of 132 ohms (see

11.6.2.2.3). Single ended I/O cable pin assignments are shown in Table 11.6.3-1a.

11.6.2.2.2 Differential I/O circuits ("ND" models)

The maximum total cable length for use with drives having differential I/O drivers and receiver circuits shall be 25 metres (82 ft.). A stub length of no more than 0.2 metre (0.66 ft.) is allowed off the mainline interconnection with any connected equipment. An ideal impedance match with cable terminators implies a cable characteristic impedance of 122 ohms (see 11.6.2.2.3). Differential I/O pin assignments are shown in Table 11.6.3-1b.

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11.6.2.2.3 General cable characteristics

In general, cables having the characteristic impedance’s given in 11.6.2.2.1 and 11.6.2.2.2 are not available; however, impedance’s that are somewhat lower are satisfactory. A characteristic impedance of 100 ohm +10% is recommended for unshielded flat or twisted pair ribbon cable. However, most available cables have a somewhat lower characteristic impedance. To minimize discontinuities and signal reflections, cables of different impedance’s should not be used in the same bus. Implementations may require trade-offs in shielding effectiveness, cable length, the number of loads, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered. Proper impedance matching is especially important in order to maintain adequate margin at FAST SCSI transfer rates.

For models ST31200N/ND:

Only nonshielded cable connectors are applicable. A 50 conductor flat cable or 25 twisted pair cable shall be used. A minimum conductor size of 28 AWG should be used to minimize noise effects.

Suggested nonshielded flat cable part numbers are: Flat cable - 35M-3365-50 Twisted pair - Spectra Twist in flat 455-248-50

For model ST31200NC/ST3620NC:

The 80 pin connector option is intended for use on drives that plug directly into a PCB or wall/bracket mounted connector in the host equipment. Cable mounted connectors would not be used in such a case. Installation with cable mounted connectors are not recommended.

11.6.3 Mating connector requirements

11.6.3.1 Mating connectors for models ST31200N/ND

The nonshielded cable connector shall be a 50 conductor connector consisting of two rows of 25 female contacts with adjacent contacts 100 mils apart.

Recommended mating flat cable connector part numbers are: Closed end 3M-3425-7000 W/O Strain Relief, No Center Key

(for cable 3M-3425-7050 With Strain Relief, No Center Key ends)* Dupont-66900-290 With Strain Relief, With Center Key

Open end 3M-3425-6000 W/O Strain Relief, No Center Key (In Daisy-chain) 3M-3425-6050 With Strain Relief, No Center Key

Dupont-66900-250 With Strain Relief, With Center Key *See Figure 11.6.3-2. The drive device connector is a nonshielded 50 conductor connector consisting of two rows of 25 male pins

with adjacent pins 100 mils apart. The connector is keyed (see Figure 11.6.3-1a).

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11.6.3.2 Mating connectors for model ST31200NC/ST3620NC

The nonshielded connector shall be an 80 conductor connector consisting of two rows of 40 contacts with adjacent contacts 50 (1.27 mm) mils apart.

Recommended PCB or bulkhead mounted connectors are: Straight-in connector (most commonly used): Seagate P/N: 77678703

Amp US P/N: 2-557103-1 Amp Japan P/N: 5-175475-9

Right angle to PCB connector: Seagate P/N: 77678559

Amp US P/N: 2-557101-1 Amp Japan P/N: 5-175474-9

11.6.3.3 Jumper plug part number for J2

Option select header connector J2 on the PCB (see Figure 10.1-1) uses an unusual type of jumper plug so its part number is given here for reference. Suggested part number for J2 jumper:

Molex 52747-0211 (Seagate P/N 77679052)

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.370 ± .010

(9.398)

.100

(2.54)

(1.30)

.16

(4.06)

.051

.037 Ref. Typ. (.94)

.025 (.64)

Sq. Contact

50 Places

"D" ± .010

.045

(1.14)

"C" ± .010

"B" Ref.

"A" ± .010

.42

(10.67)

Pin 1

.100

Typ.

(2.54)

Min. Typ. 3

Ref.

No. Pos.



.834 ± .010

(21.18)

"A"



3.767

(95.68)

.60

(15.24)

"B"



3.697

(93.90)

.20

Typ.

(5.08)

.065

x 45° Chamfer Typ.

(1.65)

.26

(6.60)

.335 ± .010

.040

(1.02)

"C"



2.720

(69.09)

Typ.

(8.50)

+.001

.083

–.002 (2.1) Trifurcated Pin (4 places)

Ref.

"D"



2.400

(60.96)

Dia.

Figure 11.6.3-1a. Nonshielded 50 pin SCSI device connector, models ST31200N/ND

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2.70

(.106)

Section X–X

1.32

(.052)

Pin 1

Side View

1.52

(.060)

57.87

(2.278)

62.15

(2.447)

Housing

0.15

0 –0.15 + .000

[

– .006

MYM

–Y–

± 0.15 (± .005)

MYM

7.00

(.276)

12.70 (.500)

[

Front View

Insert cable

connector here

Top View

PCB Contacts

Contacts are recessed along the center strip (see side view).

0.50

(.020)

0.3

(.012)

MYM

Pin 1

1.27 (.05)

Typ

of Datum Y

Back View

Figure 11.6.3-1b. Nonshielded 80 pin SCSI connector, used on Model ST31200NC/ST3620NC

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VIEW B - T indicates termination required

Total interface cable length must not exceed that specified in paragraph

11.6.2.2. (including host adapter/initiator). * Closed end type connector used.

** Open end type (in-line application) connector used. *** Host need not be on the end of the daisychain. Another device can be on the end

with the terminator, the host having no terminator.

Figure 11.6.3.-2. Interface cabling

Table 11.6.3-1a. Single ended, 50 pin cable pin assignments (Nonshielded connector)

Disc Drive or

Other SCSI

Device

SCSI Device

Host Adapter/Initiator

SCSI Devices

Disc Drive or

Other SCSI

Device

* * *

1 thru 8

** ** *

Disc Drive or

Other SCSI

Device

Signal Pin Number Signal Pin Number

-DB (0) 2 GROUND 30

-DB (1) 4 -ATN 32

-DB (2) 6 GROUND 34

-DB (3) 8 -BSY 36

-DB (4) 10 -ACK 38

-DB (5) 12 -RST 40

-DB (6) 14 -MSG 4 2

-DB (7) 16 -SEL 44

-DB (P) 18 -C/D 46

GROUND 2 0 -REQ 48 GROUND 2 2 -I/O 50 GROUND 2 4 TERMPWR 26 GROUND 2 8

Notes.

1. All odd pins except pin 25 are connected to ground. Pin 25 is left open.

Caution

Pin 25 must not be connected to ground at the HOST end or the drive end of the cable. If the I/O connector should accidentally be plugged upside down, terminator power on pin 26 will be shorted to ground.

2. The minus sign next to the signals indicates asserted state is the low voltage of the two levels used for logic signals.

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Table 11.6.3-1b. Differential cable pin assignments (Nonshielded connector)

+Signal Name* Pin Number -Signal Name*

SHIELD GND 1 2 GROUND +DB(0) 3 4 -DB(0) +DB(1) 5 6 -DB(1) +DB(2) 7 8 -DB(2) +DB(3) 9 10 -DB(3) +DB(4) 11 12 -DB(4) +DB(5) 13 14 -DB(5) +DB(6) 15 16 -DB(6) +DB(7) 17 18 -DB(7) +DB(P) 19 20 -DB(P) DIFFSENS 21 22 GROUND GROUND 23 24 GROUND TERMPWR 25 26 TERMPWR GROUND 27 28 GROUND +ATN 29 30 -ATN GROUND 31 32 GROUND +BSY 33 34 -BSY +ACK 35 36 -ACK +RST 37 38 -RST +MSG 39 40 -MSG +SEL 41 42 -SEL +C/D 43 44 -C/D +REQ 45 46 -REQ +I/O 47 48 -I/O +GROUND 49 50 GROUND

* See Paragraph 11.6.4.2 for detailed electrical characteristics of these differential signals.

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Table 11.6.3-1c. Single ended, 80 pin cable pin assignments (Non-shielded connector)

Signal Pin number Signal Pin number

+12 V 1 12 V GND 41 +12 V 2 12 V GND 42 +12 V 3 12 V GND 43 +12 V 4 12 V GND 44 NC 5 NC 45 NC 6 NC 46 NC 7 GND 47 NC 8 GND 48 NC 9 GND 49 NC 10 GND 50

-IO 11 GND 51

-REQ 12 GND 52

-CO 13 GND 53

-SEL 14 GND 54

-MSG 15 GND 55

-RST 16 GND 56

-ACK 17 GND 57

-BSY 18 GND 58

-ATN 19 GND 59

-DBP 20 GND 60

-DB7 21 GND 61

-DB6 22 GND 62

-DB5 23 GND 63

-DB4 24 GND 64

-DB3 25 GND 65

-DB2 26 GND 66

-DB1 27 GND 67

-DB0 28 GND 68 NC 29 GND 69 NC 30 GND 70 NC 31 GND 71 NC 32 GND 72 NC 33 GND 73 +5 V 34 5 V GND 74 +5 V 35 5 V GND 75 +5 V 36 5 V GND 76 SYNC [1] 37 LEDC [2] 77 MTRON [3] 38 DLYDST [4] 78 SCSIAO [5] 39 SCSIA1 [5] 79 SCSIA2 [5] 40 SCSIA3 [5] 80

Notes: Signals [1] thru [5] are used in place of installing jumpers and cables on option select connectors J2,

J5 and J6. See also notes following Figure 10.1-1. [1] Synchronous spindle synchronizing signal, generated by either host or drive. [2] Front panel LED signal; indicates drive activity for host front panel hard drive activity indicator. [3] Asserted by host to enable Motor Start option (starts motor via SCSI bus command). [4] Asserted by host to enable Delayed Motor Start option (motor starts at power on or after a delay

of 12 seconds times drive ID. This and [3] above are mutually exclusive options.

[5] Binary code on A3, A2, A1 and A0 asserted by host to set-up SCSI bus ID in drive.

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11.6.4 Electrical description

Model ST31200N/NC and ST3620N/NC drive uses single ended interface signals. These signals must be terminated with 110 ohm active termination circuits at each end of the total cable. On model ST31200N/NC and ST3620N/NC only, the terminators are enabled (or disabled) by installing (or removing) jumper plug TE. See Figure 10.1-1. Single Ended circuits use open collector or three state drivers. See Figure 11.6.4-1 and 11.6-1. Not all drives have the factory installed terminator module U5.

The model ST31200ND uses differential interface signals and each of these must be terminated at each end of the total cable with 330 ohms to +5 V and 330 ohms to ground with 150 ohms between each differential pair. All I/O circuits are open collector, three state drivers. See Figure 11.6.4-2 for circuit drawing. Differential I/O drives are shipped without terminators. These drives have no provisions for adding terminator sockets on the PCB. On these drives some method of external termination must be provided by the drive user, systems integrator or host equipment manufacturer.

11.6.4.1 Single ended drivers/receivers

For models ST31200N/NC and ST3620N/NC which use single ended drivers and receivers, typical circuits are shown in Figure 11.6.4-1. Terminator circuits (Note [1]) are to be enabled (model ST31200N/NC and ST3620N) only when the disc drive is first or last in the daisychain.

For the models ST31200NC and ST3620NC, the host equipment sometimes provides arrangements for terminators where needed. In some installations terminator modules are factory installed on the drive PCB. See paragraph 11.6.4.3.

Transmitter Characteristics

Single ended drives use an ANSI SCSI compatible open collector single ended driver. This driver is capable of sinking a current of 48 mA with a low level output voltage of 0.4 volt.

Receiver Characteristics

Single ended drives use an ANSI SCSI single ended receiver with hysteresis gate or equivalent as a line receiver.

Line Driver

Transmitter

(or transceiver)

[2]

TP TP

[4]

[1]

110

Ohm

Flat

Cable

Pair

[3]

Line Receiver

[4]

110

[1]

Ohm

Receiver

[2]

[1] Part of active terminator circuits. Non-removable LSI terminators, enabled in the drive (models ST31200N/

NC and ST3620N only) with jumper plug TE when it is first of last in the daisychain. Interface signals levels and logical sense at the drive I/O connector are defined as follows:

Logic Level Driver Output Receiver Input

NEGATED (0) >2.5 V: <5.25 V >2.0 V: <5.25 V ASSERTED (1) <0.4 V: >0.0 V <0.8 V: >0. 0 V The difference in the voltages between input and output signals is due to the losses in the cable.

[2] ANSI SCSI compatible circuits [3] Total interface cable length should not exceed that specified in Section 11.6.2.2.1. [4] Source of drive terminator power is an active circuit which has an input source voltage selected by jumper

plug TP. See Figure 10.1-1. Applies to model ST31200N/NC and ST3620N only.

Figure 11.6.4-1. Single ended transmitters and receivers

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11.6.4.2 Differential drivers/receivers

Differential drivers and receivers are used by the model ST31200ND. Typical circuits are shown in Figure

11.6.4-2. The drive has no provisions for terminator circuits on differential I/O drives.

Differential Signals

All differential interface signals consist of two lines denoted +SIGNAL and -SIGNAL. A signal is true when +SIGNAL is more positive than -SIGNAL, and a signal is false when -SIGNAL is more positive than +SIGNAL. All assigned signals shall be terminated at each end of the cable as shown in Figure 11.6.4-2. Drive user or systems integrator must provide some external means of termination.

Output Characteristics

Each signal driven by differential interface drives shall have the following output characteristics when measured at the disc drive SCSI connector:

Low-level output voltage* = 2.0 V maximum at Low-level output current = 55 milliamps. High-level output voltage* = 3.0 V minimum at High-level output current = -55 milliamps Differential voltage = 1.0 V minimum with common-mode voltage ranges from -7 V dc to +12 V dc.

* These voltages shall be measured between the output terminal and the SCSI device’s logic ground reference. The output characteristics shall additionally conform to EIA RS-485-1983.

Input Characteristics

Each signal received by differential interface drives shall have the following input characteristics when measured at the disc drive SCSI connector:

Input current on either input = +2.0 milliamps maximum (includes both receivers and passive drivers). This requirement shall be met with the input voltage varying between -7 V dc and +12 V dc, with power on or

off, and with the hysteresis equaling 35 mv, minimum. The input characteristics shall additionally conform to EIA RS-485-1983.

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+5V

5.6K

Transmit/Receive

Enable (1)

DIFFSENS (6) Disable

Transmit or Receive Signal (2)

SCSI Device at Beginning of I/O Cable (usually Host Adaptor/Initiator)

+5V

LSI

XCVR

Term

(5)

Power

330

(4)

Ohm

1 1

+5V

Transmit/Receive

Enable (1)

DIFFSENS (6)

Transmit or Receive Signal (2)

5.6K

Ohm

330

Ohm

150

(7)



Twisted or Flat

(3)

Cable Pair



+5V

LSI

XCVR

Disable

1 1

Term

Power

330

Ohm

150

Ohm

330

Ohm

(5)

(4)

(7) SCSI Device at End of I/O Cable (Drive/Target)



Notes.

[1] Positive Logic Enables Transmitter (+5 V = Asserted)

Negative Logic Enables Receivers (0 V = Asserted) [2] Negative Logic Signal (0 V = Asserted) [3] Total interface cable length should not exceed value given in paragraph 11.6.2.2 from first SCSI device

at beginning to end of daisychain. See section 11.6.4.2 for signal characteristics. [4] I/O Line terminators. If SCSI device is a Seagate disc drive, terminators and a place to plug them in must

be provided external to the drive by user, systems integrator or host equipment manufacturer where

needed. The drive has no terminators and there are no provisions on the drive for terminator installation. [5] Arrangements for connecting terminator power to the terminators must be made by the systems designer.

As a help, drive +5 V power is made available on SCSI bus pin 26 for powering external terminators if the

drive option select header jumper TP (Figure 10.1-1) is installed in rightmost position “TP”. [6] SCSI I/O line (pin 21) disables I/O circuits if single-ended cable plugged in or cable plugged in upside down. [7] SCSI I/O cable ground. See Table 11.6.3-1b.

Figure 11.6.4-2. Typical differential I/O line transmitter/receiver and external terminators

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11.6.4.3 Terminator requirements

Drive I/O termination is provided internally only in single ended I/O model ST31200N/NC and ST3620N/NC drives. All single initiator/single target (nondaisychain) applications require that the Initiator and disc drive be terminated. Daisychain applications require that only the units at each end of the daisychain be terminated. All other peripherals on the chain must not be terminated. (See Figure 11.6.3-2). It is highly recommended that ANSI SCSI-2 Standard's Alternative 2 termination (active termination) be used for single-ended ST31200N/NC, and ST3620N/NC applications, especially if the bus will be operated at transfer rates above 5 Mbytes/sec. The ST31200N/NC and ST3620N/NC provide on-board active termination that can be disabled by removal of the enable jumper TE (see Figure 10.1-1).

Note. Remove drive terminator enabling jumper TE (see Figure 10.1-1) where terminators are not required.

Removal of terminator power source selection jumper TP (see Figure 10.1-1) does not disconnect the terminator resistors from the circuit.

Note. Active terminators are highly recommended for use in the daisychain as described above. Active and

passive terminators should not be mixed on the same SCSI bus.

Differential I/O ST31200ND does not have terminators on the PCB. The user, systems integrator or host equipment manufacturer must provide a terminator arrangement external to the drive. Models ST31200NC and ST3620NC may not have terminators on the drive PCB, in which case they will be in the host equipment, when required. There is no provision for terminator power in the 80 pin I/O connector.

11.6.4.4 Terminator power

The drive may be configured to accept terminator power via pin 26 of the SCSI Bus, to supply power to the SCSI bus or to provide terminator power for optional internal termination resistors via the drive power connector. See Figure 11.6-1 and 10.1-1. The drive can provide power both to its own terminators and to the SCSI Bus terminator power line (Pin 26) if both "TP" jumpers are on (models ST31200N/ND and ST3620N only).

SCSI devices providing terminator power (TERMPWR)* shall have the following characteristics:

V TERM = 4.50 V to 5.25 V 800 mA min source drive capability

1.0 A maximum

*See Figure 10.1-1 for configuration details.

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11.7 Disc drive SCSI timing

Table 11.7-1. Disc drive SCSI timing*

Waveform Waveform

Description Symbol [1] Table [1] Typical Max

Target Select Time (no Arbitration) T00 N/A <1 µs 250 µs Target Select Time (with Arbitration) T01 4.5-1,2 2.34 µs 2.44 µs Target Select to Command T02 4.5-1 3.82 µs 3.84 µs Target Select to MSG Out T03 4.5-2 1.51 µs 1.64 µs Identify MSG to Command T04 4.5-3 3.56 µs 3.64 µs Command to Status T05 4.5-5 Command Dependent Command to Data (para. In) T06 4.5-9 Command Dependent Command to Data (para. Out) T07 4.5-10 Command Dependent Command to Data (Write to Data Buffer) T08 4.5-10 Command Dependent Command to Disconnect MSG T09 4.5-6 Command Dependent Disconnect MSG to Bus Free T10 4.5-6,14 0.68 µs 0.78 µs Disconnect to Arbitration (for Reselect) T11 4.5-6 Command Dependent This measures disconnected CMD overhead. Target win Arbitration (for Reselect) T12 4.5-7 3.0 µs Arbitration to Reselect T13 4.5-7 1.82 µs Reselect to Identify MSG In T14 4.5-7 1.52 µs Reselect Identify MSG to Status T15 4.5-8 Command Dependent Reselect Identify MSG to Data (media) T16 4.5-11 Command Dependent Data to Status T17 4.5-15 Command Dependent Status to Command Complete MSG T18 4.5-5,8,15 1.04 µs Command Complete MSG to Bus Free T19 4.5-5,8,15 0.80 µs Data to Save Data Pointer MSG T20 4.5-14 5.0 µs Save Data Pointer MSG to Disconnect

MSG T21 4.5-14 0.85 µs Command Byte Transfer T22 4.5-4 0.06 µs Next Command Byte Access 4.5-4 Next CDB Byte Access (Byte 2 of 6) T23.6.2 4.5-4 0.54 us 0.64 µs Next CDB Byte Access (Byte 3 of 6) T23.6.3 4.5-4 0.11 us 0.14 µs Next CDB Byte Access (Byte 4 of 6) T23.6.4 4.5-4 0.12 us 0.14 µs Next CDB Byte Access (Byte 5 of 6) T23.6.5 4.5-4 0.13 us 0.14 µs Next CDB Byte Access (Byte 6 of 6) T23.6.6 4.5-4 0.11 us 0.14 µs

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continued from previous page

Waveform Waveform

Description Symbol [1] Table [1] Typical Max.

Asynchronous Data Transfer Characteristics: (continued)

Next CDB Byte Access (Byte 2 of 10) T23.10.2 4.5-4 0.51 µs 0.60 µs

Next CDB Byte Access (Byte 3 of 10) T23.10.3 4.5-4 0.13 µs 0.14 µs

Next CDB Byte Access (Byte 4 of 10) T23.10.4 4.5-4 0.11 µs 0.14 µs

Next CDB Byte Access (Byte 5 of 10) T23.10.5 4.5-4 0.12 µs 0.14 µs

Next CDB Byte Access (Byte 6 of 10) T23.10.6 4.5-4 0.12 µs 0.14 µs

Next CDB Byte Access (Byte 7 of 10) T23.10.7 4.5-4 0.11 µs 0.14 µs

Next CDB Byte Access (Byte 8 of 10) T23.10.8 4.5-4 0.12 µs 0.14 µs

Next CDB Byte Access (Byte 9 of 10) T23.10.9 4.5-4 0.11 µs 0.14 µs

Next CDB Byte Access (Byte 10 of 10) T23.10.10 4.5-4 0.13 µs 0.14 µs

Data In Byte Transfer (parameter) T24 4.5-12 0.06 µs

Data Out Byte Transfer (parameter) T25 4.5-13 0.06 µs

Next Data In Byte Access (parameter) T26 4.5-12 0.10 µs 0.14 µs

Next Data Out Byte Access (parameter) T27 4.5-13 0.12 µs 0.14 µs

Data In Byte Transfer (media) [2] T28 4.5-12 0.04 µs 0.06 µs

Data Out Byte Transfer (media) [2] T 29 4.5-13 0.04 µs 0.06 µs

Next Data In Byte access (media [2] T30 4.5-12 0.12 µs 0.14 µs

Next Data Out Byte access (media [2] T31 4.5-13 0.10 µs 0.14 µs

MSG IN Byte Transfer T32 4.5-5,7 0.06 µs

4.5-8,14,15 MSG OUT Byte Transfer T33 4.5-2 0.06 µs STATUS Byte Transfer T34 4.5-5,8 0.06 µs

4.5-15 Synchronous Data Transfer Characteristics:

Request Signal Transfer Period [3] - - various 800 ns

Notes.

[1] See SCSI-2 Interface Manual P/N 77738479 (called Volume 2), section 4.5 [2] Maximum SCSI asynchronous interface transfer rate is given in section 5.3. [3] Synchronous Transfer Period is determined by negotiations between an Initiator and a Drive. The Drive

is capable of setting periods as given in section 11.5. See also sections 3.1.5.2 and 3.5.3.2 of the SCSI2 Interface Product Manual (P/N 77738479) for a description of synchronous data transfer operation.

General timing diagrams for SCSI interface operation are shown in the SCSI-2 Interface Product Manual P/N 77738479, Section 4.5. The specific timing values that apply to this drive are listed in Table 11.7-1.

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12.0 Options

All options are incorporated or packaged at the manufacturing facility.

12.1 Front panel

The normal front panel available is black plastic. Other panel colors may be special ordered. Each panel has a single rectangular green rectangular LED indicator lens which, when glowing, indicates the drive is selected.

12.2 Single unit shipping pack

The drive is normally shipped in bulk packaging to provide maximum protection against transit damage. Units shipped individually require additional protection as provided by the single unit shipping pack. Users planning single unit distribution should specify this option.

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13.0 Accessories

All accessories are designed for implementation by the customer.

13.1 Front panel kit

Same as 12.1 but includes all mounting hardware to support field installation.

13.2 Installation Guide

The Installation Guide (P/N 77767453) provides basic information on the care and handling of Winchester disc peripherals in general. Some information needed when installing the drive is included to assist individuals not familiar with the product. It also includes basic information to assist in obtaining service for the drive.

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14.0 Seagate Technical support services

Seagate Technology provides technical support literature and diagnostic utilities to Authorized Distributors. Please contact your dealer for technical support and installation troubleshooting. Product Technical Support is available for all Seagate products by calling the SeaFAXTM, SeaFONETM, SeaTDDTM or SeaBOARD services. These are toll calls.

SeaFAX number: United States 408/438-2620 England 44-62-847-7080

You can use a touch-tone telephone to access Seagate’s automated FAX delivery system and select technical support information by return FAX. This service is available 24 hours a day, 7 days a week.

Seagate Technical Support FAX: 408/438-8137

You can FAX specific questions or comments to Seagate technical support specialists 24 hours daily. Responses are FAXed between 8:00 a.m. and 5:00 p.m. (Pacific time), Monday through Friday.

SeaFone telephone number: 408/438-8222

The enhanced phone system provides recorded technical information on selected Seagate products while you are on hold. Technical support specialists are available to answer questions from 8:00 AM to 5:00 PM PST, Monday through Friday. Recordings are accessible 24 hours a day, 7 days a week.

SeaTDD telephone number: 408/438-5382

TDD is a Telecommunication Device for the Deaf where two people can communicate using a keyboard that is connected to the phone line. A TDD device is required to access this service. This service is available from 8:00 AM to 5:00 PM PST, Monday through Friday.

SeaBOARD service:

The Seagate Technical Support Bulletin Board System (BBS) is available 24 hours a day, 7 days a week. A modem is required to access this service. Model required. (300–9600 baud, 8-N-1). This is a toll call.

With this service you can access:

• Specifications and jumper configurations for all Seagate products.

• Reprints of Seagate documentation.

• A directory of information and helpful utilities that you can download to your own computer.

BBS Modem Location Number

USA, Mexico, Latin America 408/438-8771 England 44-62-847-8011 France 33-1-40-67-1034 Germany 49-89-140-9331 Singapore 65-292-6973 Australia 61-2-756-2359 Korea 82-2-556-7294 Thailand 662-531-8111

CompuServe:

Online technical support for Seagate Products is available on CompuServe. Type "Go Seagate" to access our technical support forum.

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Seagate Peripheral Family

Listed below are some of the SEAGATE Peripheral family members. For specific information on each member, refer to the appropriate documents.

Model Model Product Unformatted Name Number Manual Interface Capacity (MB)

HAWK 1 Family

ST11200 ST11200N/ND/NC 77738476(I) SCSI-2 1248*

ST1980N/ND/NC 77738476(I) SCSI-2 1021* ST1950N 77738476(I) SCSI-2 953 ST1830N 77738476(I) SCSI-2 834

HAWK 2 Family

ST12400 ST12400N/ND/NC 77767450(I) SCSI-2 2537*

ST11900N/ND/NC 77767450(I) SCSI-2 2003*

ST12400 Wide ST12400W/WD/WC 77767457(I) SCSI-2 2537*

HAWK 1LP Family

ST31200 ST31200N/ND/NC 77767452(I) SCSI-2 1258.8*

ST3620N/NC 77767452(I) SCSI-2 651.8*

ST31200 Wide ST31200W/WD/WC 77767461(I) SCSI-2 1258.8*

ST3620W 77767461(I) SCSI-2

HAWK 2LP Family

ST32430 ST32430N/ND 77767471(I) SCSI-2 2.59 GB*

ST31230N/ND 77767471(I) SCSI-2 1.28 GB*

ST32430 Wide ST32430W/WD/WC/DC 77767480(I) SCSI-2 2.59 GB*

ST31230W/WD/WC/DC 77767480(I) SCSI-2 1.28 GB*

HAWK 2XL Family

ST32151 ST32151N 77767489(I) SCSI-2

ST31051N 77767489(I) SCSI-2

HAWK 4 Family

ST15230 ST15230N/ND 77767472(I) SCSI-2 5170 MB* ST15230 Wide ST15230W/WD/WC/DC 77767479(I) SCSI-2 5170 MB*

SCSI INTERFACE

SCSI Interface Manual, Vol. 2 77765466 (II)** SCSI-2 N/A** SCSI Interface Manual; Vol. 2; Ver. 2 77738479 (II)** SCSI-2/SCSI-3 N/A**

* Product Manual covers both Single-Ended and Differential Interfaces. ** Interface Manual for several different Product Manuals (Volume 2 of 2 Volume set).

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Model Model Product Unformatted Name Number Manual Interface Capacity

(MB)

ST3600 ST3500N 77738477(I) SCSI-2 502

ST3600N 77738477(I) SCSI-2 617 ST3610N/ND/NC 77738495(I) SCSI-2 635* ST3600A 77738485 AT (IDE) 617

ST1480 ST1400N 77765458(I) SCSI-2 383 Family ST1401N 77765458(I) SCSI-2 390

ST1480N 77765458(I) SCSI-2 492 ST1481N 77765458(I) SCSI-2 492 ST1581N 77738471(I) SCSI-2 610 ST1480A 77738463 AT (IDE) 490 ST1400A 77738463 AT (IDE) 381 ST1401A 77738463 AT (IDE) 395

WREN 5 ST4442E 77765300 ESDI 442 (15 Hd, 1412 Cyl) Family ST4383E 77765300 ESDI 383 (13 Hd, 1412 Cyl)

ST4384E 77765300 ESDI 383 (15 Hd, 1224 Cyl) ST4702N 77765336 SCSI 702 ST4385ND ST4702ND 77765366 SCSI 385, 702 (Dif. I/O)* ST4385N 77765378 SCSI 385 (15 Hd, 791 Cyl)

WREN 6 ST4766N/ND 77765353 SCSI 766 (Dif. I/O)* Family ST4766E 77765358 ESDI 766, 383

WREN 6 HH ST2383N/502N 77765414 SCSI-1 383, 502 Family ST2274A/383A 77765393 AT (IDE) 274, 383

ST2182E/383E 77765369 ESDI 182, 383

WREN 7 ST41200N/ND 77765417 SCSI 1200* Family ST41200N/ND 77765374 SCSI-2 1200*

WREN 8 ST41650N 77765470 (I) SCSI-2 1650 Family ST41651N/ND 77738474 (I) FAST SCSI-2 1650

WREN 9 ST42100N 77738475 (I) FAST SCSI-2 2200 Family

WRENRNR-2 ST4767N 77765445 (I) SCSI-2 767 (Fast Access) Family ST4767E/769E 77765457 ESDI 767

* Product Manual covers both Single-Ended and Differential Interfaces.

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Page 78

Seagate Technology, Inc. 920 Disc Drive, Scotts Valley, California 95066-4544, USA

Publication Number: 77767452, Rev. D (03/95)