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Disable the EPC Feature 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
-
-
-
-
-
-
-
-
Sector Count
-
-
-
-
-
-
-
-
Sector Number
-
-
-
-
0
1
0
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 220 Disable the EPC feature subcommand
On successful completion of this EPC subcommand, the device:
a) stop all EPC timers
b) disables the EPC feature set; and
c) clears IDENITFY DEVICE data word 120 bit 7 to zero.
If the EPC feature set is disabled, then the EPC feature set remains disabled across all resets (i.e., power-on reset,
hardware reset, and software reset).
Output Parameters To The Device
Sector Number
bit
Description
7-4 Reserved
3-0 5h Disable the EPC feature subcommand (See Table 73)
Error Output
If the Extended Power Condition feature set is disabling, not supported then the device returns command aborted.
268
Western Digital Ultrastar DC HC310 SATA Product Manual