
SCSI-2 Drive Command Set
Test Unit Ready Command (00H)
Chapter 22-8
Test Unit Ready Command (00H)
This command determines the READY state of a drive. If the drive is in a
READY state when it receives this command, it returns a GOOD status.
A drive is in the READY state when the optical disk is loaded and spun
up, and a read or write operation could successfully complete.
If the drive is not ready when it receives this command, it returns a
CHECK CONDITION with a sense key of NOT READY.
Table 2-4 Test Unit Ready Command CDB
Byte 7 6 5 4 3 2 1 0
0 Operation Code (00H)
1 Logical Unit Number
(0)
Reserved (0)
2 Reserved (0)
3 Reserved (0)
4 Reserved (0)
5 Reserved (0) Flag Link
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