SCSI Commands: 14BSCSI Command Descriptor Blocks
Page
23
5
A3h
05h
REPORT DEVICE IDENTIFIER
158
5 A3h
0Ch REPORT SUPPORTED OPERATION
CODES
162
5 A3h
0Dh REPORT SUPPORTED TASK
MANAGEMENT FUNCTIONS
166
5
A4h
06h
SET DEVICE IDENTIFIER
209
5 B4h
SECURITY PROTOCOL OUT (LTO4
drives)
195
3.1.1
SCSI Command Conventions
The commands in this chapter are listed in alphabetical order. Each command is
described, its Command Descriptor Block (CDB) illustrated, and the Completion
Status is given. Bits and fields defined in the ANSI SCSI documents that are not
used by the drive are not described in this document. Bits and fields that are
supported by the drive are described.
3.2
SCSI Command Descriptor Blocks
A host makes request of the tape drive by sending a Command Descriptor Block
(CDB). Some commands also require a parameter list. If the CDB or the parameter
list contains an invalid parameter, the drive terminates the command, returning a
Sense Key of Illegal Request, without altering the medium.
3.2.1
SCSI Command Descriptor Block Formats
SCSI six-byte Command Descriptor Blocks are arranged in the format shown in the
following table.
Byte
Bits
7 6 5 4 3 2 1 0
0
Operation Code
1
Ignored LUN
Command Dependent
2
Command Dependent
3
Command Dependent
4
Command Dependent
5
Control
SCSI ten-byte Command Descriptor Blocks are arranged in the format shown in the
following table.
Byte
Bits
7 6 5 4 3 2 1 0
0
Operation Code
1
Ignored LUN
Command Dependent
2
Command Dependent
3
Command Dependent
4
Command Dependent
5
Command Dependent
6
Command Dependent
7
Command Dependent
Содержание LTO 4
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