The DEVICE CONFIGURATION FREEZE LOCK command prevents accidental modification of the Device Configuration Overlay settings. After successful execution of a DEVICE CONFIGURATION FREEZE LOCK command, 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.

11.8.45.3

Device Configuration Identify

 

 

 

 

 

 

 

COMMAND CODE

1 0 1 1 0 0 0 1

REGISTER

 

 

 

REGISTER SETTING

NORMAL COMPLETION

 

DR

 

DRIVE No.

no change

 

CY

 

 

na

no change

 

HD

 

 

na

no change

 

SN

 

 

na

no change

 

SC

 

 

na

no change

 

FT

 

 

C2h

no change

 

LBA

 

 

na

no change

The DEVICE CONFIGURATION IDENTIFY command returns a 512 byte data structure via PIO data-in transfer. The content of this data structure indicates the selectable commands, modes, and feature sets that the device is capable of supporting. If a DEVICE CONFIGURATION SET command has been issued reducing the capabilities, the response to an IDENTIFY DEVICE or IDENTIFY PACKET DEVICE command will reflect the reduced set of capabilities, while the DEVICE CONFIGURATION IDENTIFY command will reflect the entire set of selectable capabilities.

The format of the Device Configuration Overlay data structure is shown in Table 11.8-8.

Table 11.8-8 Device Configuration Identify data stracture

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