Deskstar T7K500 Hard Disk Drive Specification
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12.3 Device Configuration Overlay (B1h)
Table 71: 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 72: Device Configuration Overlay Features register values
12.3.1 DEVICE CONFIGURATION RESTORE (Subcommand C0h)
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.
12.3.2 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
7654321 0 76543 21 0
CRC UNC 0 IDN 0 ABT T0N AMN BSY RDY DF DSC DRQ COR IDX ERR
00000V0 0 VV0-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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