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Introduction Page 1
Introduction
Overview
The Seagate DDS-4 and DAT 72 DAT drives are designed for computer
environments requiring high performance, high capacity data storage. These drives
are available in 3.5-inch or 5.25-inch internal configurations or as an external
subsystem. The Autoloaders contain a DDS-4 or DAT 72 drive with an enclosure
and tape manipulation mechanism.
Seagate DDS-4 and DAT 72 drives contain an embedded Small Computer Systems
Interface (SCSI) controller. These drives provide synchronous or asynchronous
SCSI and a high speed burst synchronous data transfer rate of 80 Mbytes/second.
The internal drive form factors are tailored for easy installation in today's computers
and the full-featured embedded SCSI controller facilitates easy integration into a
variety of systems.
Drive Models
This manual provides detailed information about the SCSI interface and SCSI
commands that apply to Seagate DDS-4 and DAT 72 tape drives and autoloaders.
These drives offer electronically erasable, programmable, read-only memory (flash
EEPROM) for SCSI firmware, which enables qualified Seagate OEMs to download
revised firmware to the drive via two methods: using the SCSI bus or using a
specialized Seagate firmware tape cartridge.
About This Manual
The information in this manual applies to DDS-4 and DAT 72 drives and
autoloaders. For specific installation and operational information—including SCSI
connection information—refer to the Installation Guide or Product Description
Manual for the specific model of your drive or Autoloader. The following table
outlines the chapters in this manual.
Chapter Title Description
1 Introduction Introduces the SCSI interface and explains
the structure of this manual.
2 SCSI Interface
Description
Provides general information about the SCSI
interface for the DDS-4 and DAT 72 drives.
3 Commands Lists and describes the SCSI commands.
1
- Contents 5
- Commands 34 6
- Introduction 13
- SCSI Interface Description 14
- Signal Descriptions 15
- Command Set Description 16
- General features 17
- SCSI Bus Protocol 18
- Waiting and Control Phases 19
- Figure 2-1 20
- Figure 2-2 20
- Select With Attention 22
- Identify Message 22
- Information Transfer Phases 23
- Figure 2-4 24
- Synchronous Data Transfer 25
- Command Phase 26
- Data Phase 27
- Status Phase 27
- Message Phase 27
- Command Descriptor Block 28
- Logical Unit Support 29
- Attention Condition 36
- Reset Condition 36
- Unit Attention Condition 36
- Buffered Mode 37
- Immediate Function 37
- Residual Length Function 37
- SCSI Memory Address Pointers 39
- Early Warning Function 39
- Error Reporting 40
- Autoloader Operation 41
- General Operation 43
- Loading and Initialization 43
- Front Panel Operation 44
- Cassette Selection 44
- Automatic Loading Mode 44
- Magazine Ejection 45
- Stray Tape Recovery 45
- Commands 46
- Conventions 47
- ERASE (19h) 49
- INQUIRY (12h) 53
- Standard INQUIRY Data Format 54
- LOAD/UNLOAD (1Bh) 57
- LOCATE (2Bh) 59
- LOCATE and the BT Bit 60
- LOG SELECT (4Ch) 62
- Use of the PC Bits 63
- LOG SELECT Parameter Data 64
- LOG SENSE (4Dh) 69
- Using Page Control Bits 71
- Log Sense Pages 72
- Page Header 73
- MODE SELECT (15h) 85
- MODE SELECT Parameters 86
- Completion Status 100
- MODE SENSE (1Ah) 101
- MODE SENSE Parameters 103
- Mode Page Format 105
- READ (08h) 117
- READ BLOCK LIMITS (05h) 122
- READ DATA BUFFER (3Ch) 124
- READ DATA BUFFER Header 125
- Element Status Data 126
- Element Status Data Header 127
- READ POSITION (34h) 131
- READ POSITION Data Format 132
- RELEASE UNIT (17h / 57h) 138
- REPORT DENSITY SUPPORT (44h) 140
- REQUEST BLOCK ADDRESS (02h) 143
- REQUEST SENSE (03h) 145
- Definition of Sense Keys 147
- RESERVE UNIT (16h / 56h) 158
- REWIND (01h) 161
- SEEK BLOCK (0Ch) 162
- SEND DIAGNOSTIC (1Dh) 164
- SPACE (11h) 166
- Space-by-Count Functions 167
- Space and the RSMK Bit 168
- TEST UNIT READY (00h) 170
- VERIFY (13h) 172
- WRITE (0Ah) 174
- WRITE DATA BUFFER (3Bh) 176
- WRITE FILEMARKS (10h) 179
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