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81h Idle_a
82h Idle_b
83h Idle_c
84h..FEh Reserved
FFh Device is not waiting to enter a lower power condition
19
Device is held in the current power condition
18:0
Reserved
DEVICE
Bit Description
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
STATUS
Bit Description
7:6 Transport Dependent
5 DEVICE FAULT bit
4 N/A
3 Transport Dependent
2 N/A
1 SENSE DATA AVAILABLE bit
0 ERROR bit
Error Outputs
Field
Description
ERROR
Bit Description
7:3 N/A
2 ABORT bit
1:0 N/A
COUNT
N/A
LBA
N/A
DEVICE
Bit Description
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
STATUS
Bit Description
7:6 Transport Dependent
5 DEVICE FAULT bit
4:2 N/A
1 SENSE DATA AVAILABLE bit
0 ERROR bit
The Check Power Mode Command will report the current power mode of the device. This includes whether the
device is spun up and the media is available for immediate access. This command will not cause the device to
change its power management state.
139
Hard Disk Drive Specification