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Extended Power Conditions (EPC) Feature
Restore Power Condition Settings Subcommand
Command Block Output Registers
Command 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
0
0
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 215 Restore Power Condition Settings Subcommand
On successful completion of this EPC subcommand, the device updates the Power Conditions log for the selected
Power Condition ID as follows:
1) if Default is set to one, then:
A) copy the Default Timer Settings field to the Current Timer Settings field; and
B) copy the Default Timer Enabled field to the Current Timer Enabled field;
2) if Default is cleared to zero, then:
A) copy the Saved Timer Settings field to the Current Timer Settings field; and
B) copy the Saved Timer Enabled field to the Current Timer Enabled field;
and
3) if Save is set to one and the power condition is savable, then:
A) copy the Current Timer Settings field to the Saved Timer Settings field;
Output Parameters To The Device
Sector Count
Power Condition ID (See Table 74)
Sector Number
bit
Description
7
Reserved
6
Default
1
Restore from Default settings
0
Restore from Saved settings
5
Reserved
4
Save
1
Save settings on completion
0
Do not save settings on completion
3-0
0h Restore Power Condition subcommand (See Table 73)
Error Output
If any selected Power Condition is not supported, or is not changeable, or if Extended Power Condition feature set
is disable, or if Save is set to one and any selected power condition is not savable, then the device returns
command aborted .
262
Western Digital Ultrastar DC HC310 SATA Product Manual