=> R0 = reason code
0 => read drive spin status
1 => set drive autospindown
2 => control drive spin directly without affecting autospindown
R1 = drive
R2 = drive autospindown, if R0 = 1;
5 × number of seconds
or action to take, if R0 = 2;
0 to spin down immediately
otherwise, spin up immediately
<= R2 = drive spin status, if R0 = 0;
0 if drive isn't spinning
non-zero if drive is spinning
R3 = previously value for drive autospindown, if R0 = 1
This call controls the power saving features of the ADFS system. It can be dangerous to use this call on drives that not fully support drive spin control. The controller on at least two drives tested hang up when autospindown is enabled; a reset doesn't recover the situation, althought a power-down reset does.
See PRM 2, page 291.
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