249
Western Digital Hard Disk Drive OEM Specification
11.46.6.4
Set Power Condition State subcommand
Com m and Block Output Registers
Com m and Block Input Registers
Register
7
6
5
4
3
2
1
0
Register
7
6
5
4
3
2
1
0
Data
-
-
-
-
-
-
-
-
Data
-
-
-
-
-
-
-
-
Feature
0
1
0
0
1
0
1
0
Error
…See Below …
Sector Count
V
V
V
V
V
V
V
V
Sector Count
-
-
-
-
-
-
-
-
Sector Number
-
-
V
V
0
0
1
1
Sector Number
-
-
-
-
-
-
-
-
Cylinder Low
-
-
-
-
-
-
-
-
Cylinder Low
-
-
-
-
-
-
-
-
Cylinder High
-
-
-
-
-
-
-
-
Cylinder High
-
-
-
-
-
-
-
-
Device/Head
1
-
1
D
-
-
-
-
Device/Head
-
-
-
-
-
-
-
-
Command
1
1
1
0
1
1
1
1
Status
…See Below …
Error Register
Status Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC
UNC
0
IDN
0
ABT
T0N
AMN
BSY
RDY
DF
DSC
DRQ
COR
IDX
ERR
0
0
0
0
0
V
0
0
0
V
0
-
-
0
-
V
Table 216 Set Power Condition State subcommand
On successful completion of this EPC subcommand, the device updates the Power Conditions log for the Power
Condition as follows:
1)
If the Enable bit is set to one, then enable the Current Timer; otherwise disable the Current Timer; and
2)
If the Save bit is set to one, then copy the Current Timer Enabled field to the Saved Timer Enabled field.
Output Parameters To The Device
Sector Count
Power Condition ID (See Table 74)
Sector Number bit Description
7-6
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
3h Set Power Condition State subcommand (See Table 73)
Error Output
If the Power Condition is not changeable, or not supported, or if Extended Power Conditions feature set is disabling,
then the device returns command aborted. If the Save bit is set to one and the selected power condition is not
savable, then the device returns command aborted. If command aborted is returned, then the device makes no
modifications to the power condition settings.
