Andre Hedrick writes:
> APM signals ATA/IDE to goto sleep.
> IDE then records and buffers the setup of the host and device.
> IDE forces device and host to PIO 0 (imortant step, explain later)
> IDE issues spindown and sleep task-command.
> IDE returns to APM with success/failure.
Insert here... BIOS tries to hibernate to disk and finds the disk already
asleep.
> success, sets request_queue blocker flag (very critical)
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