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12.9 Format Unit (F7h)
The Format Unit command initializes all user data sectors after merging reassigned sector location into the defect
information of the device and clearing the reassign information. Both new reassign information and new defect
information are available right after command completion of this command. Previous information of reassign and
defect are erased from the device by executing this command.
Note that the Format Unit command initializes from LBA 0 to Native MAX LBA regardless of setting by Initialize Device
Parameter (91h) command, Device Configuration Overlay, or Set Max Address (F9h) command, so the protected
area defined by these commands is also initialized.
Security Erase Prepare (F3h) commands should be completed just prior to the Format Unit command. If the device
receives a Format Unit command without a prior Security Erase Prepare command, the device aborts the Format Unit
command.
All values in Feature register are reserved, and any values other than 11h should not be put into Feature register.
This command does not request to data transfer.
Command execution time depends on drive capacity. To determine command timeout value, Word 89 of Identify
Device data should be referred.
FORMAT UNIT command needs to complete successfully for the drive to be useable. If the command is interrupted
by a reset, power down or unrecoverable error, the Drive enters a degraded mode of operation in which reading or
writing are prohibited. To exit the degraded mode, another FORMAT UNIT command must be sent by the host and
completed successfully by the drive.
Table 97 Format Unit Command (F7h)
Command Input
Field
Description
FEATURE
11h
COUNT
Reserved
LBA
Reserved
DEVICE
Bit Description
7:5 Obsolete
4 Transport Dependent
3:0 Reserved
Command
7:0 F7h
Normal Outputs
Field
Description
ERROR
Reserved
COUNT
Reserved
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 N/A
3 Transport Dependent
2 N/A or ALIGNMENT ERROR bit
1 SENSE DATA AVAILABLE bit
0 ERROR bit
154
Hard Disk Drive Specification