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11.8.1 Nop (00h)
COMMAND CODE
0 0 0 0 0 0 0 0
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR drive no. no change
CY no change
HD no change
SN no change
SC no change
FT no change
LBA no change
The Nop command reports the status. The drive terminates the command with aborted error after receiving
this command.
11.8.2 Recalibrate
5
(1xh)
COMMAND CODE
0 0 0 1 X X X X
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR drive no. no change
CY 00H
HD no change
SN no change
SC no change
FT no change
LBA 00H
This command will set BSY bit and move the R/W heads on the disk to cylinder 0. At the completion of a
seek , it revises the status, resets BSY and generates an interrupt.
11.8.3 Flush Cache (E7h)
COMMAND CODE 1 1 1 0 0 1 1 1
RESISTER SETTING DR drive no.
This command reports the completion of a Write cache to the host. At the completion of a Write cache,
the drive revises the status, resets BSY and generates an interrupt.
11.8.4 Flush Cache EXT (EAh)
COMMAND CODE 1 1 1 0 1 0 1 0
RESISTER SETTING DR drive no.
This command reports the completion of a Write cache to the host. At the completion of a Write cache,
the drive revises the status, resets BSY and generates an interrupt.
5
ATA/ATAPI-4 defines this command as Vendor specific. The drive supports this command to maintain ATA-3, and the previous
models compatibility. User is recommended not to use this command.