Western Digital Ultrastar DC HC310 - Page 262

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Western Digital Hard Disk Drive OEM Specification
Output Parameters To The Device
Sector Count
Power Condition ID (See Table 74)
Sector Number
bit
Description
7
Timer Units
If the Timer Units bit is cleared to zero, then the Timer (Cylinder High and Cylinder Low bit
15-0) are specified in units of 100 milliseconds. If the Timer Units bit is set to one, then the
Timer (Cylinder High and Cylinder Low bit 15-0) are specified in units of 1 minute.
6
Reserved
5
Enable
1
Enable the selected power condition
0
Disable the selected power condition
4
Save
1
Save settings on completion
0
Do not save settings on completion
3-0
2h Set Power Condition Timer subcommand (See Table 73)
Cylinder Low
15-0
If the new timer value is greater than the maximum value setting, then the device set the
value to the maximum setting. If the new timer value is less than the minimum setting, then
the device set the value to the minimum setting.
(Cylinder High and Cylinder Low bit 15-0)
Cylinder High
Error Output
The device returns command aborted If:
a) the new timer value is:
A) less than the maximum setting.
B) greater than the minimum setting.
C) not supported by the device.
b) the Extended Power Condition feature set is disabling.
c) the power condition is not changeable or not supported.
d) the Save bit is set to one and the selected power condition is not savable.
e) the new time value is greater than the maximum setting and the device did not set the timer to the maximum
setting.
f) the new time value is less than the minimum setting and the device did not set the timer to the minimum setting.
If command aborted is returned, then the device makes no modifications to the power condition settings.
Maximum Setting is 3BFFC4h (100ms unit). Minimum Setting is zero.