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b.
In the case of the stop specification ("Start" bit = "0")
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C141-C013
When the Immed bit is "0," the power condition state becomes
Active_Wait, and the spindle motor is started after the NOTIFY
(ENABLE SPINUP) primitive has been received. Then, when the disk
drive enters the ready state, the status byte is reported and command
execution is completed. In this case, the INIT has no means of detecting
the timing when the power condition state becomes Active_Wait, and
there are no limitations on the time period in which the system waits the
NOTIFY (ENABLE SPINUP) primitive. Therefore, the INIT needs to
issue the NOTIFY (ENABLE SPINUP) primitive after this command is
issued and before the spindle motor becomes ready.
When the Immed bit is "1," after the power condition state becomes
Stopped, instructing the drive to stop the spindle motor is sufficient so
that the GOOD status is reported and command execution is completed.
When the Immed bit is "0," after the power condition state becomes
Stopped and the spindle motor enters the Stopped state, the status byte is
reported and command execution is completed.
4.1 Control/Sense Commands
179
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