Quantum DAT 40, DAT 72 SCSI User Manual
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DAT 72 and DDS-4 Tape Drives
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CD72LWH
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CD72LWE
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STD1401LW
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STD2401LW
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STD6401LW
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Product Manual
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Copyright © 2003 by Certance LLC. All Rights Reserved..
Part Number: 50000712, June 2003
Certance and the Certance logo are trademarks of Certance LLC. Seagate is a trademark of
Seagate Technology LLC. Other product names are trademarks or registered trademarks of their
respective owners.
Certance 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 from Certance LLC.
Certance provides this manual “as is,” without warranty of any kind, either expressed or implied,
including, but not limited to, the implied warranties of merchantability and fitness for a particular
purpose. Certance reserves the right to change, without notification, the specifications contained
in this manual.
Certance assumes no responsibility for the accuracy, completeness, sufficiency, or usefulness of
this manual, nor for any problem that might arise from the use of the information in this manual.
FCC Notice
This equipment generates and uses radio frequency energy and, if not installed and
used properly—that is, in strict accordance with the manufacturer’s instructions—
may cause interference to radio communications or radio and television reception. It
has been tested and found to comply with the limits for a Class B computing device
in accordance with the specifications in Part 15 of FCC Rules, which are designed to
provide reasonable protection against such interference in a residential installation.
However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause interference to radio or television reception,
which can be determined by turning the equipment on and off, you are encouraged
to try to correct the interference by one or more of the following measures:
•
Reorient the receiving antenna.
•
Relocate the computer with respect to the receiver.
•
Move the computer into a different outlet so that the computer and receiver are
on different branch circuits.
If necessary, you should consult the dealer or an experienced radio/television
technician for additional suggestions. You may find the booklet, How to Identify and
Resolve Radio-TV Interference Problems, prepared by the Federal Communications
Commission, helpful. This booklet (Stock No. 004-000-00345-4) is available from the
U.S. Government Printing Office, Washington, DC 20402.
Warning.
Changes or modifications made to this equipment which have not been
expressly approved by Seagate may cause radio and television
interference problems that could void the user’s authority to operate the
equipment.
Further, this equipment complies with the limits for a Class B digital apparatus in
accordance with Canadian Radio Interference Regulations.
Cet appareil numérique de la classe B est conforme au Règlement sur brouillage
radioélectrique, C. R. C., ch. 1374.
The external device drive described in this manual requires shielded interface cables
to comply with FCC emission limits.
Additional Warnings:
•
To prevent fire or electrical shock hazard, do not expose the unit to rain or
moisture.
•
To avoid electrical shock, do not open the cabinet.
•
Refer servicing to qualified personnel.
About This Manual
This is the product manual for DAT 72 and DDS-4 internal and external tape drives.
It describes how to use the DAT 72 and DDS-4 drives.
Following are brief descriptions of the sections in this manual.
Chapter 1, “Introduction” provides general specifications, features and an
overview on DDS technology.
Chapter 2, “Specifications” contains physical, performance, environmental,
reliability, and power specifications.
Chapter 3, “Installation” provides cautions, unpacking tips, inspection information
and installation/connection steps.
Chapter 4, “Drive Operation and Maintenance” explains the operation of the drive
and describes necessary maintenance procedures.
Chapter 5, “Theory of Operations” details the functional operation of various
assemblies of the drive.
Chapter 6, “Data Compression” describes the data compression algorithm and
explains pertinent information for effective use of data compression.
iii
Contents
Contents
Introduction 1
Overview......................................................................................................................1
DDS Format Standard Compatibility.....................................................................1
DAT 72 and DDS-4 Capacity and Transfer Rates................................................2
Features ......................................................................................................................3
DAT 72 and DDS-4 Drive Models................................................................................4
Specifications 7
Overview......................................................................................................................7
Physical Specifications................................................................................................7
Power Specifications ...................................................................................................9
Drive Performance Specifications .............................................................................10
Environmental Requirements ....................................................................................12
Reliability ...................................................................................................................12
Mean Time Between Failures .............................................................................13
Mean Time to Repair...........................................................................................13
DDS Cartridge Specifications....................................................................................13
Regulatory Compliance.............................................................................................14
Installation 15
Introduction................................................................................................................15
Unpacking and Inspection.........................................................................................15
Installing an Internal Drive.........................................................................................15
Guidelines and Cautions.....................................................................................16
Configuring an Internal Drive ..............................................................................16
DIP Switch Settings.............................................................................................18
Mounting an Internal Drive..................................................................................20
Installing an External Drive........................................................................................24
Configuring the External Drive ............................................................................24
Connecting the SCSI Interface Cable.................................................................25
Connecting the Power Cord................................................................................25
Drive Operation and Maintenance 27
Loading a Cartridge...................................................................................................27
iv
DAT 72/DDS Product Manual
Unloading a Cartridge................................................................................................27
Initializing a Blank Cartridge......................................................................................28
DDS Cartridge Compatibility......................................................................................28
Write-Protecting a Cartridge ......................................................................................28
LED Codes.................................................................................................................29
Clean LED...........................................................................................................30
Media LED...........................................................................................................30
Drive LED............................................................................................................30
LED Code Summary ...........................................................................................31
Cleaning the Tape Heads..........................................................................................31
When to Clean the Tape Heads..........................................................................31
How to Clean the Tape Heads............................................................................32
Automatic Drive Spin-Down and Write.......................................................................32
Operating the Drive in High-Temperature or Humidity Conditions ............................32
Data Compression.....................................................................................................33
Loading Revised Firmware from Seagate Firmware Cartridges................................33
Flash Memory......................................................................................................33
Firmware Download Process via Tape ...............................................................33
Theory of Operations 35
Overview....................................................................................................................35
Drive Mechanism.................................................................................................35
Motors and Control Circuits .......................................................................................38
Timing Tracking Circuitry.....................................................................................38
Signal-Processing Electronics.............................................................................38
Flash Memory............................................................................................................38
Sensors......................................................................................................................39
Read-After-Write........................................................................................................39
Media Recognition System (MRS).............................................................................40
About the DDS Data Cartridge...................................................................................40
Data Compression 43
Introduction................................................................................................................43
Overview .............................................................................................................43
Data Compression Considerations......................................................................44
Hardware Compression.......................................................................................45
Data Integrity.......................................................................................................45
DCLZ Algorithm .........................................................................................................46
Simplified Compression Operation......................................................................46
Dictionary ............................................................................................................47
v
Contents
Simplified Decompression Operation..................................................................48
vi
DAT 72/DDS Product Manual
Figures
Figure 1. 3.5-Inch Internal Drive ........................................................................................................................4
Figure 2. Internal Drive with Drive Rails for Mounting in a 5.25-inch Drive Bay ................................................4
Figure 3. External Drive .....................................................................................................................................5
Figure 4. Internal Drive—Dimensions................................................................................................................8
Figure 5. Internal DDS Drive with Rails—Dimensions.......................................................................................8
Figure 6. Jumper Settings for an Internal Drive...............................................................................................17
Figure 7. DIP Switch Settings for an Internal Drive..........................................................................................18
Figure 8. Mounting an Internal Drive................................................................................................................20
Figure 9. Mounting Holes for an Internal Drive in a 3.5-inch Configuration (without mounting brackets).......20
Figure 10. Mounting Holes for an Internal Drive in a 5.25-inch Configuration (with mounting brackets)........21
Figure 11. Interface Connector on an Internal Drive........................................................................................22
Figure 12. Two SCSI Termination Examples for Internal Drives .....................................................................22
Figure 13. Power Connector on the internal Drives.........................................................................................23
Figure 14. Rear Panel of External Drives ........................................................................................................24
Figure 15. SCSI Termination Examples for External Drives............................................................................25
Figure 16. Loading a Tape Cartridge...............................................................................................................27
Figure 17. Location of the Eject Button and LEDs on internal Drives (external drive is similar)......................28
Figure 18. Write-Protect Tab on a DDS Cartridge ...........................................................................................29
Figure 19. Front Panel of an Internal Drive (external drive is similar)..............................................................29
Figure 20. Four-Head Cylinder Design............................................................................................................37
Figure 21. Alternating Azimuth Angles on Tape Tracks...................................................................................37
Figure 22. DDS Drive Cartridge Design Features............................................................................................41
Figure 23. Write-Protect Tab on the DDS Cartridge ........................................................................................41
Introduction 1
Introduction
Overview
The Seagate® DDS-4 (digital data storage) and DAT 72 (digital audio tape) drives are
designed for computer environments that require high-performance, high-capacity
data storage. Based on a 3.5-inch mechanism, the internal and external models
provide the following data storage capacities and native transfer rates:
DDS-4
DAT 72
Data Storage Capacity:
20 Gbytes
(40 Gbytes compressed)
36 Gbytes
(72 Gbytes compressed)
Native Transfer Rate:
2.75 Mbytes per second
(5.5 Mbytes per second
compressed)
3.5 Mbytes per second
(7.0 Mbytes per second
compressed)
The DAT 72 and DDS-4 drives combine established DAT technology, high-density
recording and hardware data-compression capability along with Seagate’s proven
computer-grade design to provide unmatched reliability and performance
characteristics among DDS products. The DAT 72 and DDS-4 drives are ideal for
workstation, server, and network/enterprise applications such as:
•
Backup of high-capacity fixed discs
•
Data interchange between systems
•
Network servers
•
Loader products
•
Online data collection
•
Near-line secondary storage for text, graphics or multimedia information of all
types
•
Archival storage
DDS Format Standard Compatibility
The DDS drive supports the DDS-4, DDS-3, and DDS-2 recording formats. The DAT
72 drive supports the DDS 5th Generation, DDS-4, and DDS-3 recording formats.
Compatibility with each of these standards ensures complete write and read
interchange of recorded digital data between all compliant drive and media vendors.
1
2
DAT 72/DDS-4 Product Manual
The DAT 72 and DDS-4 drives support DDS data compression. Compression
doubles a drive’s uncompressed capacity. For example, a 20 GB uncompressed
drive will be 40 GB with compression.
The DDS-4 drive complies with the following guidelines and specifications:
•
The DDS-2 recording format standard, ANSI/ECMA-198,
3,81mm Wide Magnetic
Tape Cartridge for Information Interchange - Helical Scan Recording - DDS-2
Format using 120 m Length Tapes
•
The DDS-3 recording format standard, ANSI/ECMA-236,
3,81mm Wide Magnetic
Tape Cartridge for Information Interchange - Helical Scan Recording - DDS-3
Format using 125 m Length Tapes
•
The DDS-4 recording format specification from ECMA-288:
3,81 mm Wide
Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording:
DDS-4 Format
The DAT 72 drive complies with the following guidelines and specifications:
•
The DDS-3 recording format standard, ANSI/ECMA-236,
3,81mm Wide Magnetic
Tape Cartridge for Information Interchange - Helical Scan Recording - DDS-3
Format using 125 m Length Tapes
•
The DDS-4 recording format specification from ECMA-288:
3,81 mm Wide
Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording:
DDS-4 Format
•
The DDS 5th Generation recording format specification from the HP DAT 72
Format Standard A5969-3050-1:
3,81 mm Wide Magnetic Tape Cartridge for
Information Interchange - Helical Scan Recording - DAT 72 Format Using 170 m
Length Tapes
.
Note:
For the latest ECMA standards, see the ECMA web site at
http://www.ecma.ch
DAT 72 and DDS-4 Capacity and Transfer Rates
The DAT 72 and DDS-4 drives provide the following capacities and transfer rates,
depending on the recording mode and the tape length:
Recording Mode
DDS-2*
DDS-3
DDS-4
DDS 5th Generation
Tape length
120 meters
125 meters
150 meters
170 meters
Capacity
(native)
4.0 Gbytes
12.0
Gbytes
20.0 Gbytes
36.0 Gbytes
Capacity
(compressed)
8 Gbytes
24 Gbytes
40 Gbytes
72 Gbytes
Transfer rate
(native)
1.375
Mbytes/sec
2.75
Mbytes/sec
2.75
Mbytes/sec
3.54 Mbytes/sec
* Applies to the DDS-4 drive only.
Introduction 3
In data-compression mode, the Seagate DAT 72 and DDS-4 drives typically double
the storage capacity and transfer rate of the native uncompressed operation. Tape
capacity and the sustained data-transfer rate are dependent upon the characteristics
of the files being compressed, the application software used, and system parameters
such as the speed of the host and the operating system. The DAT 72 and DDS–4
drives also offer synchronous or asynchronous SCSI transfers with a high-speed
burst data-transfer rates.
The DAT 72 and DDS-4 drives provide superb reliability through three levels of errorcorrection code (ECC) and the four-head design, which provides for read-after-write
(RAW) error detection and correction. The DAT 72 and DDS-4 drives also include a
“flying” preamplifier for greater signal-to-noise ratio.
Features
The DAT 72 and DDS-4 drives represent Seagate’s commitment to reliable
engineering and durable tape drive products that implement leading-edge
technology. Key features of the drives include:
•
A platform based on state-of-the-art sealed drive mechanism and tape-handling
components for improved immunity to airborne contaminants and extended
media life
•
Three available form factors: 3.5-inch internal for installation in a 3.5-inch halfheight space; 3.5-inch drive with factory-installed 5.25-inch mounting rails and
bezel for installation in a 5.25-inch half-height space; and external subsystem
with built-in, auto-sensing, worldwide power supply
•
ANSI/ECMA compliance and capability to write and read DDS 5th Generation
(DAT 72 only) DDS-4, DDS-3, and DDS-2 (DDS-4 only) cartridges
•
Advanced onboard DDS-DC hardware using Data Compression Lempel-Ziv
(DCLZ) data-compression algorithm
•
High-speed transfer rates for fast backups
DDS-4:
– 2.75 Mbytes per second typical—uncompressed data
– 5.5 Kbytes per second typical—compressed data
DAT 72:
– 3.5 Mbytes per second typical—uncompressed data
– 7.0 Kbytes per second typical—compressed data
•
High-performance SCSI burst transfer rate of 10 Mbytes per second
asynchronous and 80 Mbytes per second synchronous
•
Flash memory to store setup parameters and enable field firmware upgrades
•
Four-head design with RAW error detection and rewrites
•
Three levels of ECC to ensure data integrity
•
Uncorrectable error rate of less than 1 in 1015 bits
•
LVD / Ultra Wide SCSI connection
•
Automatic power-on self-test
•
Support for TapeAlert™ Certified Solutions
4
DAT 72/DDS-4 Product Manual
DAT 72 and DDS-4 Drive Models
The DAT 72 and DDS-4 3.5-inch and 5.25-inch internal drives are tailored for easy
installation in today’s computers, and the full-featured embedded SCSI controller
facilitates easy integration into a variety of systems. DAT 72 and DDS-4 models
include:
•
A 3.5-inch, half-height drive that mounts internally (see Figure 1)
Figure 1. 3.5-Inch Internal Drive
•
A 5.25-inch, half-height drive that consists of a 3.5-inch drive with 5.25-inch
mounting rails and bezel that mounts internally in a 5.25-inch, half-height space
(see Figure 2)
Figure 2. Internal Drive with Drive Rails for Mounting in a 5.25-inch Drive Bay
•
A complete external subsystem that contains the 3.5-inch drive and built-in
worldwide power supply (see Figure 3)
Introduction 5
Figure 3. External Drive
6
DAT 72/DDS-4 Product Manual
Specifications 7
Specifications
Overview
This chapter includes technical specifications for the internal and external SCSI
drives. This information covers the following specifications and requirements:
•
Physical specifications
•
Power specifications
•
Drive performance specifications
•
Environmental requirements
•
Reliability
•
DDS cartridge specifications
•
Regulatory compliance
Physical Specifications
The physical specifications of the internal and external DAT 72 and DDS-4 models
are listed in the following table:
Specification
Internal
Internal with rails
External
Height
1.6 in/41.2 mm
1.6 in/41.2 mm
2.7 in/69 mm
Width
4.0 in/101.6 mm
5.74 in/146.0 mm
6.1 in/152.0 mm
Length
5.7 in/146.0 mm
6.9 in/175.0 mm
9.3 in/235.0 mm
Weight
1.4 lb/0.62 kg
1.8 lb/0.87 kg
4.1 lb/1.8 kg
Figures 4 and 5 on the following pages show the dimensions of the internal 3.5-inch
and 5.25-inch drives.
2
8
DAT 72/DDS-4 Product Manual
Figure 4. Internal Drive—Dimensions
Figure 5. Internal DDS Drive with Rails—Dimensions
41.3 mm
(1.63 in)
13.0 mm (0.51 in)
2 places
5.0 mm (0.196 in)
2 places
M3.0 x 4 deep min.
(10 places)
90.0 mm
(3.54 in)
2 places
60.0 mm
(2.36 in)
2 places
3.8 mm (0.15 in)
101.6 mm
(4.00 in)
94.0 mm
(3.70 in)
M3.0 x 4 deep min.
(4 places)
70.0 mm
(2.75 in)
146.0 mm
(5.75 in)
21.0 mm (0.83 in)
2 places
41.2 mm
(1.62 in)
6.0 mm
(0.24 in)
Side View
Note: Tolerance for all dimensions is 0.25mm (0.01 in)
41.3 mm
(1.63 in)
31.5 mm (1.24 in)
21.8 mm (0.86 in)
9.9 mm (0.39 in)
16-M3
174.6 mm
(6.87 in)
79.4 mm
(3.13 in)
101.6 mm
(4.00 in)
Bottom View
146 mm
(5.75 in)
31.0 mm
(1.22 in)
47.6 mm
(1.87 in)
41.2 mm
(1.62 in)
Side View
Note: Tolerance for all dimensions is 0.25mm (0.01 in)
139.7 mm (5.50 in)
149.1 mm (5.87 in)
Bottom View
Specifications 9
Power Specifications
The following table lists the power specifications for the internal DAT 72 and DDS-4
drives.
Specification
+12 VDC supply
+5 VDC supply
Voltage Tolerance
+ or – 10% operating
+ or – 7% operating
Operational Current
250 milliamps max
1.35 Amps max
Standby Current
15 milliamps max
1.2 Amps max
Surge (peak)
600 milliamps max
1.5 Amps max
Ripple (peak-to-peak)
≤
100 mV (peak to peak)
≤
100 mV (peak to peak)
Total power consumption for the DAT 72 is as follows:
Standby Power
6.5 watts max
Operating Power
8.7 watts typical, 10.0 watts max
Surge (start up)
20.0 watts max (instantaneous peak)
Note:
When measured over a 20-msec period, the maximum surge power is 14.0
watts.
Total power consumption for the DDS-4 (including both the +5V and +12V power
supplies) is as follows:
Standby Power
6.0 watts max
Operating Power
9.0 watts typical, 10.0 watts max
Surge (start up)
14.0 watts max
Note:
Surge power and current are measured over a 20-msec period.
The following table lists pin assignments of the power connector for the internal DDS.
Pin
Assignment
1
+12 VDC
2
+12 return
3
+5 return
4
+5 VDC
The external drives have a built-in power supply that senses the incoming voltage
and automatically adapts to voltages within the range of 100 to 240 volts, 50 to 60
Hz. The following table lists the power specifications of the power supply.
Specification
AC Input Voltage
100 (Japan)
120 (US)
240 (European)
AC Input Current
100 milliamps
85 milliamps
170 milliamps
AC Input Power
10.0 watts
10.0 watts
10.0 watts
Note:
The drive employs a power-sensing circuit that automatically detects a loss
of supply voltage from the host. Temporary loss of supply voltage, or voltage
spikes, might result in the drive electronics being reset to their initialized
state, but shall under no circumstances result in a loss of recorded data.
10
DAT 72/DDS-4 Product Manual
Drive Performance Specifications
The following table lists the specifications for the DAT 72 drive.
Specification
Value
Capacity
125 m MP++
150 m MP+++
170 m MP++++
24.0 Gbytes
40.0 Gbytes
72.0 Gbytes
Error recovery
Read-after-write (RAW)
Reed Solomon ECC (C3 - 3 levels)
Track density (DAT 72)
4704 tracks per inch (TPI)
Recording unrecoverable errors
<1 in 1015 data bits
Tape drive type
Computer-grade 4DD mechanism
Head configuration
2 read heads, 2 write heads
Recording format
DDS 5th Generation
Recording method
Helical scan
Cartridge
73.66 mm × 53.34 mm × 10.16 mm
Transfer rate (sustained)
7.700 Kbytes per sec (DC ON)
Synchronous transfer rate (burst)
80 Mbytes per sec max
Asynchronous transfer rate (burst)
10 Mbytes per sec max
Search speed (max)
200x normal (3260 mm per sec)
Average access time
125 m cartridge
150 m cartridge
170 m cartridge
< 30 seconds
< 30 seconds
< 40 seconds
Drum rotation speed
10,000 Revolutions per Minute (RPMs)
Tape speed
2 meters per second
Head-to-tape speed
15.75 mm/second
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