SCSI Commands
Field Descriptions
Completion Status
Bits
Byte
7
6
7
8-15
Field
Bytes
Bits
LUN List
0-3
Length
Reserved
4-7
LUN 0
8-15
Future drives may supports multiple Logical Unit Numbers. This would increase the
LUN List Length and add additional LUNs to the LUN List after byte 15.
Code
Message
Description
• The drive is ready to perform any appropriate command.
00h
Good
• The drive remains in any previously set mode.
Status
• The drive accepts commands from any Initiator.
• The tape position is not changed.
02h
Check
Use the Request Sense command to retrieve status information. Possible
Condition
Sense Keys are:
Code
04h
05h
06h
5
4
3
Reserved
LUN 0
Description
Always 8, indicating the length of the LUN list, starting in byte 8.
All reserved bits must be 0.
Always 0, indicating LUN 0.
Message
Description
Hardware Error
Parity error on the SCSI bus or drive hardware
failure.
Illegal Request
The Command Descriptor Block is invalid.
Unit Attention
The cartridge was changed, or the drive was re-
set prior to this command.
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