Datasheet

Command Processing
2-24 C141-C008
(2) Commands that can be executed even in the not ready state
The IDD can execute any of the following commands when they are received,
even when in the Not Ready state.
• START/STOP UNIT command
• RESERVE command
• RELEASE command
• WRITE BUFFER command
• READ BUFFER command
• INQUIRY command
• REQUEST SENSE command: When the REQUEST SENSE command is
executed normally and the IDD is in the sense data hold state, the sense data
held at that time are transferred to the INIT. If not in the sense data hold state,
sense data corresponding to the IDD's state at that time (See Table 2.10) are
transferred to the INIT.
• REZERO UNIT command: If the direct drive's spindle motor has reached
the rated speed, even if reading of system information failed, these
commands are executed. When the spindle motor has not reached the rated
speed, or if reading of system information is in progress, the IDD responds
with the CHECK CONDITION status in the same way as in item 2.7.4 (1).
(3) Operation if formatting is not completed normally
While the FORMAT UNIT command is not being executed following a change of
parameters related to data format with the MODE SELECT command, or if the
operation terminates abnormally for any reason (for example, the power going off
or a RESET condition) during FORMAT UNIT command execution, the data on
the disk medium cannot be accessed normally. In this case, the IDD responds to
disk medium access commands with the CHECK CONDITION status.
The sense data generated at this time show MEDIUM ERROR [= 3]/Medium
format corrupted [=31 - 00] in the case of the former, and MEDIUM ERROR [=
3]/FORMAT command failed [=31-01]. In both cases, the IDD is restored to a
usable condition by using the FORMAT UNIT command and reinitializing the
disk medium.