Seagate Technology STT8000 User manual
Seagate Technology
STT8000 ATAPI Minicartridge Drive
Product Description Manual
July 1997
Part Number 10002475-003
Stocking Number 601-087
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 and television reception. It has
been type 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:
z
Reorient the receiving antenna.
z
Relocate the computer with respect to the receiver.
z
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 following booklet
prepared by the Federal Communications Commission helpful:
How to Identify and Resolve Radio-TV Interference Problems
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 Technology 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.
Seagate and the Seagate logo are registered trademarks of Seagate Technology.
All other trademarks mentioned in this manual are the property of their
respective owners.
Copyright 1996, Seagate Technology
All rights reserved.
Document No. 10002475-003
Stocking No. 601-087
Important Information About This Manual
All information contained in or disclosed by this document is considered
proprietary by Seagate Technology. By accepting this material, the recipient
agrees that this material and the information contained therein are held in
confidence and in trust and will not be used, reproduced in whole or in part, nor
its contents revealed to others, except to meet the purpose for which it was
delivered. It is understood that no right is conveyed to reproduce or translate
any item herein disclosed without express written permission from Seagate
Technology.
Seagate Technology 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. Seagate
Technology reserves the right to change, without notification, the specifications
contained in this manual.
Seagate Technology 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.
Product Description Manual Page v
Table of Contents
1 Introduction 1
Overview 1
Features 3
Typical System Configurations 4
Minicartridge Technology Overview 4
Flash EEPROM 5
Software 5
References 6
About This Manual 6
2 Specifications 7
Overview 7
Physical Specifications 7
Power Specifications 9
Drive Performance Specifications 10
Environmental Requirements 11
Recommended Tapes 11
Tape Capacities and Formats 12
Regulatory Compliance 12
3 Installation 13
Introduction 13
Before You Begin 13
Check the Package Contents 13
Guidelines 14
Installation Summary (Default) 14
Installing the Seagate IDE Adapter Card 15
Installing the Drive Unit 17
Custom Installation with the Seagate IDE
Adapter Card 23
Configuring the Seagate IDE Adapter Card 24
4 Drive Operations 27
Introduction 27
Front Panel LED Operation 27
Using Cartridges 28
Loading and Unloading Tape Cartridges 28
Setting the Write-Protect Switch 29
Loading Revised Firmware via Seagate Firmware
Cartridge 30
Table of Contents
Page vi STT8000 ATAPI Minicartridge Drive
5 ATAPI Interface 33
Introduction 33
ATA-2 Interface 33
ATA-2 Signals 33
ATA Registers 34
Supported ATA Commands 36
ATAPI Interface 39
6 Tape Format 55
Introduction 55
Tape Partitioning 55
Track Positions 55
Track Numbering 56
Track Format 56
Frames 56
Blocks 58
Tape Reference Servo Pattern 58
Write Equalization 59
Randomization 59
7 Theory of Operations 61
Overview 61
Block Diagrams 61
Understanding the Drive 61
Mechanics 63
Cartridge Load Mechanism 63
Capstan Drive Motor Assembly 63
Chassis 63
Control Circuits 63
Head Design 64
Flash EEPROM 64
Sensors and Switches 64
Media—Minicartridges 65
8 Maintenance, Troubleshooting, and
Reliability 67
Maintenance 67
Caring for Tape Cartridges 67
Cleaning the Drive Read/Write Head 67
Troubleshooting 68
Reliability 70
Mean-Time-Between Failures 70
Mean-Time-To-Repair 70
Table of Contents
Product Description Manual Page vii
A Glossary 71
B Acronyms and Measurements 75
Acronyms and Abbreviations 75
Measurements 76
Table of Contents
Page viii STT8000 ATAPI Minicartridge Drive
NOTES
Product Description Manual Page 1
Introduction
Overview
The Seagate STT8000 ATAPI minicartridge drive extends the Seagate family of
one-inch high, DC2000 drives that feature high performance, high reliability,
and quiet operation. The drive transfers data at up to 36 megabytes per minute
(MB/min) without compression. With optimal system resources and
compressible data structures, nominal transfer rates of 60 MB/min can be
observed using software data compression (assumes 2:1 compression ratio).
The system optimizations include but are not limited to
z
Allocating the maximum amount of the base 640 KB memory available
z
Using a memory manager program
Note: During backup tasks, screen savers can have a negative affect on
transfer rates.
Data compression is available within the Seagate Backup software package for
DOS and Windows and typically provides for a 2:1 compression ratio. The
compression ratio is dependent on the specific system and the nature of the files
being compressed.
This drive optimizes throughput through the Seagate feature FastSenseTM. This
feature enables the drive to automatically sense the fastest supportable data
transfer rate of the host system and choose a transfer speed of either 600, 450,
or 300 kilobytes/second (KB/sec). This process maximizes system throughput by
eliminating tape repositioning, which is typically required when the tape drive
operates faster than the host computer.
The product is available as an internal device in either a 3.5-inch or half-high
5.25-inch configuration. The drive form factors are tailored for easy installation
in today's computers.
The drive supports the QIC-3095 format standard and will provide 4 gigabytes
uncompressed storage capacity, 8 gigabytes compressed, with a Travan TR-4
cartridge.
The drive will also write and read tapes conforming to the QIC-3080 standard,
providing 1.6 and 2.0 gigabytes respectively on 400 foot minicartridges or 400
foot QIC-Wide cartridges.
A precision burst intelligent positioning system is used to achieve high track
densities.
1
Chapter 1 Introduction
Page 2 STT8000 ATAPI Minicartridge Drive
The STT8000 ATAPI minicartridge drive conforms to the QIC-3095
development standard adopted by Quarter-Inch Cartridge Drive Standards Inc.
(QIC). The drive records in a serpentine fashion utilizing a 1,7 RLL (Run
Length Limited) data encoding method, and provides for 72 data tracks and one
(1) directory track on Travan TR-4 media.
The drive offers electronically erasable, programmable, read-only memory (flash
EEPROM), which enables qualified Seagate OEMs to download revised
firmware to the drive.
With the availability of greater capacity disk drives and the growth of small
networks, the need for cost-effective, high-capacity storage has grown. The
STT8000 ATAPI minicartridge drives are ideal for high-end standalone
computers, workstations, and small networks.
Built using long-wearing materials and custom Large Scale Integration (LSI)
components, the ATAPI drive was engineered for heavy-duty computer
applications. Providing carefully controlled tape handling and rapid, smooth
operation, the design promotes long life for key components such as the motors,
drive heads, and the media itself. One major benefit of this new, computer
grade engineering is low power consumption.
Figure 1-1 illustrates the STT8000 ATAPI minicartridge internal drive. Figure
1-2 illustrates the internal drive equipped with rails.
Figure 1-1
STT8000 ATAPI Minicartridge Internal Drive
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Table of contents
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