Deskstar 7K250 Hard Disk Drive Specification
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12.2 Device Configuration Overlay (B1h)
Table 52: Check Power Mode Command (E5h/98h)
Individual Device Configuration Overlay feature set commands are identified by the value placed in the Features
register. The table below shows these Features register values.
Table 53: Device Configuration Overlay Features register values
12.2.1 DEVICE CONFIGURATION RESTORE
The DEVICE CONFIGURATION RESTORE command disables any setting previously made by a DEVICE
CONFIGURATION SET command and returns the content of the IDENTIFY DEVICE or IDENTIFY PACKET
DEVICE command response to the original settings as indicated by the data returned from the execution of a
DEVICE CONFIGURATION IDENTIFY command.
12.2.2 DEVICE CONFIGURATION FREEZE LOCK (subcommand C1h)
The DEVICE CONFIGURATION FREEZE LOCK command prevents accidental modification of the Device Con-
figuration Overlay settings. After successful execution of a DEVICE CONFIGURATION FREEZE LOCK com-
mand, all DEVICE CONFIGURATION SET, DEVICE CONFIGURATION FREEZE LOCK, DEVICE
CONFIGURATION IDENTIFY, and DEVICE CONFIGURATION RESTORE commands are aborted by the
device. The DEVICE CONFIGURATION FREEZE LOCK condition shall be cleared by a power-down. The
DEVICE CONFIGURATION FREEZE LOCK condition shall not be cleared by hardware or software reset.
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
1 0 1 0 V V V V
Error
see below
Sector Count
- - - - - - - -
Sector Count
V V V V V V V V
Sector Number
- - - - - - - -
Sector Number
- - - - - - - -
Cylinder Low
- - - - - - - -
Cylinder Low
V V V V V V V V
Cylinder High
- - - - - - - -
Cylinder High
V V V V V V V V
Device/Head
- - - D - - - -
Device/Head
- - - - - - - -
Command
1 0 1 1 0 0 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
V
V
0
-
V
-
-
V
Value
Command
C0h
DEVICE CONFIGURATION RESTORE
C1h
DEVICE CONFIGURATION FREEZE LOCK
C2h
DEVICE CONFIGURATION IDENTIFY
C3h
DEVICE CONFIGURATION SET
other
Reserved
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