SCSI Commands
Page
109
Byte
Bits
7
6
5
4
3
2
1
0
1
Ignored LUN Reserved
2
Reserved
3
Ignored Third Party Device ID
4
Reserved
5
Reserved
6
Reserved
7
Reserved
8
Reserved
9
Control
Field Descriptions for 10-Byte Command
Field
Bytes
Bits
Description
Operation
Code
0
The Operation code for the 10-byte version of Reserve Unit is 57h.
Ignored
Logical
Unit
1
5-7
The LUN field is residual from the SCSI-1 days and is ignored.
Ignored
Third Party
Device ID
3
This field is ignored by the drive.
Reserved
All reserved bits must be 0.
Control
9
See Control Byte Format on page 18.
Completion Status
Code
Message
Description
00h
Good
Status
•
The drive is ready to perform any appropriate command.
•
The drive remains in any previously set mode.
•
The drive is reserved for the use of the specified ID.
•
The tape position is not changed.
02h
Check
Condition
Use the Request Sense command to retrieve status information. Possible
Sense Keys are:
Code
Message
Description
02h
Not Ready
No cartridge is in the drive.
03h
Media Error
Unrecoverable data error encountered.
04h
Hardware Error
Parity error on the SCSI bus or drive hardware
failure.
05h
Illegal Request
The Command Descriptor Block is invalid.
06h
Unit Attention
The cartridge was changed, or the drive was
reset prior to this command.
18h
Reservation
Conflict
The drive is reserved for another initiator.
