CHAPTER 4 Command Specifications 4.1 Control/Sense Commands
4.2 Data Access Commands
4.3 Format Commands
4.4 Maintenance, Diagnostic Commands
This chapter describes detailed specifications of the SCSI commands which the
HDD is equipped with and how to use them.
4.1 Control/Sense Commands
4.1.1 TEST UNIT READY (00)
Bit
Byte 7 6 5 4 3 2 1 0
0 X'00'
1 0 0 0 0 0 0 0 0
2 0 0 0 0 0 0 0 0
3 0 0 0 0 0 0 0 0
4 0 0 0 0 0 0 0 0
5 0 0 0 0 0 0 0 0
This command checks the status of the disk drive.
If the HDD is in the ready state and it is possible for it to be used by the INIT
(initiator) which issues this command, a GOOD status is reported for this
command.
If the HDD is not in the ready state, it reports a CHECK CONDITION status for
this command. The sense data generated at this time indicate the HDD's state at
this time.
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