Western Digital Ultrastar DC HC310 - Table 99 Check Power Mode Command (E5 H;98 H)

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Western Digital Hard Disk Drive OEM Specification
11.1 Check Power Mode (E5h/98h)
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
-
-
-
-
-
-
-
-
Error
…See Below …
Sector Count
-
-
-
-
-
-
-
-
Sector Count
V
V
V
V
V
V
V
V
Sector Number
-
-
-
-
-
-
-
-
Sector Number
-
-
-
-
-
-
-
-
Cylinder Low
-
-
-
-
-
-
-
-
Cylinder Low
-
-
-
-
-
-
-
-
Cylinder High
-
-
-
-
-
-
-
-
Cylinder High
-
-
-
-
-
-
-
-
Device/Head
1
-
1
D
-
-
-
-
Device/Head
-
-
-
-
-
-
-
-
Command
1
1
1
0
0
1
0
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 99 Check Power Mode Command (E5h/98h)
The Check Power Mode command will report whether the device is spun up and the media is available for immediate
access.
Input Parameters From The Device
Sector Count
The power mode code.
If the Extended Power Conditions feature set is disabled and the device is in Idle mode, Check
Power Mode returns FFh by Sector Count Register, instead of returning 80h. Check Power Mode
returns 0 in the Sector Count Register if the device is in Standby mode.
If the Extended Power Conditions feature set is enabled, the command returns power condition.
idle_a condition is 81h, idle_b condition is 82h, idle_c condition is 83h, standby_y condition is 01h,
standby_z condition is 00h.