360014937 |
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10.8.20 Power Control |
| (Exh) |
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| COMMAND CODE |
| 1 1 1 0 X X X X | REGISTER | |
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| REGISTER SETTING | NORMAL COMPLETION | ||
| DR |
| drive no. | no change | |
| CY |
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| no change |
| HD |
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| no change |
| SN |
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| no change |
| SC |
| shown below | 00/FFH (for E5/98 command) | |
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| no change (for other command) |
| FT |
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| no change |
Power Control is a group of commands which controls low power mode in the drive. The drive has three types of power mode:
Idle,
At the completion of disk access, the drive automatically enters the idle mode.
There are two ways to shift to the
By a command from the host
By internal timer
The internal timer is set by
If the drive receives disk access command from the host when it is in
After power on, the spindle starts rotating and enters the idle mode. During idle or
To be specific , there are four different
10.8.20.1 Stand-by Immediate (E0/94)
SC=X (Don't care)
The drive enters the
10.8.20.2 Idle Immediate (E1/95)
SC=X
The drive enters the idle mode immediately by this command. If the drive is already in the idle mode, it does
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