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11.1
Check Power Mode (E5h/98h)
Com m and Block Output Registers
Register
7
6
Data
-
-
Feature
-
-
Sector Count
-
-
Sector Number
-
-
Cylinder Low
-
-
Cylinder High
-
-
Device/Head
1
-
Command
1
1
Error Register
7
6
5
4
CRC
UNC
0
IDN
0
0
0
0
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.
5
4
3
2
1
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
D
-
-
-
-
1
0
0
1
0
1
3
2
1
0
0
ABT
T0N
AMN
0
V
0
0
Western Digital Hard Disk Drive OEM Specification
Com m and Block Input Registers
Register
7
6
Data
-
-
...See Below ...
Error
Sector Count
V
V
Sector Number
-
-
Cylinder Low
-
-
Cylinder High
-
-
Device/Head
-
-
...See Below ...
Status
Status Register
7
6
5
4
BSY
RDY
DF
DSC
0
V
0
-
123
5
4
3
2
1
0
-
-
-
-
-
-
V
V
V
V
V
V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
3
2
1
0
DRQ
COR
IDX
ERR
-
0
-
V
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