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SCSI Commands
Field Descriptions for 10-Byte Command
Completion Status
Bits
Byte
7
6
1
Ignored LUN
2
3
4
5
6
7
8
9
Field
Bytes
Bits
Operation
0
Code
Ignored
1
5-7
Logical
Unit
Ignored
3
Third Party
Device ID
Reserved
Control
9
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 is reserved for the use of the specified ID.
• The tape position is not changed.
02h
Check
Use the Request Sense command to retrieve status information. Possible
Condition
Sense Keys are:
Code
02h
03h
04h
05h
06h
18h
Reservation
The drive is reserved for another initiator.
Conflict
5
4
3
Reserved
Reserved
Ignored Third Party Device ID
Reserved
Reserved
Reserved
Reserved
Reserved
Control
Description
The Operation code for the 10-byte version of Reserve Unit is 57h.
The LUN field is residual from the SCSI-1 days and is ignored.
This field is ignored by the drive.
All reserved bits must be 0.
See Control Byte Format on page 18.
Message
Description
Not Ready
No cartridge is in the drive.
Media Error
Unrecoverable data error encountered.
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
reset prior to this command.
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