Test Unit Ready Command (00H) - Seagate SCSI Interface Product Manual

SCSI Interface Product Manual, Rev. J
5.47

Test Unit Ready command (00h)

The Test Unit Ready command provides a means to verify the logical unit is ready. This is not a request for a
self test. If the logical unit (drive) can accept an appropriate medium access command without returning check
condition status, the drive returns a Good status. See Table 169 for proper format.
Table 169: Test Unit Ready command (00h)
Bit 7
Byte
0 0
0
1
Logical Unit Number [1]
2 0
3 0
4 0
5 0
Notes.
[1] The Logical Unit Number must be zero.
[2] See "Control byte," paragraph 4.2.6.
If the drive cannot become operational or is in a state such that an initiator action (e.g., Start command) is
required to make the unit ready, the drive returns Check Condition status with a Sense Key of Not Ready. One
of several possible additional sense codes indicates the reason for the Not Ready condition.
6 5
0 0
0 0
0 0
0 0
0 0
0 0
4 3
0 0
0 0
0 0
0 0
0 0
0 0
2 1
0 0
0 0
0 0
0 0
0 0
0 Flag [2] Link [2]
211
0
0
0
0
0
0