Specifications

5.4.12 Recalibrate command
This command (command code 1 x
H
, where x can by any value from 0
H
to F
H
) moves the read/write heads from anywhere on the disc to cylinder
0. Upon receipt of the command, the drive sets BSY and issues a seek
to cylinder zero. The drive then waits for the seek to complete before
updating status, clearing BSY and generating an interrupt.
If the drive cannot reach cylinder 0, a Track Not Found error is posted.
Drives with Power Management facilities that are in a low power state
when this command is received may signal completion of this command
without leaving the low power state.
5.4.13 Seek command
This command (command code 7 x
H
, where x can by any value from 0
H
to F
H
) initiates a seek to the track and selects the head specified in the
command block. The drive will not set DSC=1 until the action of seeking
has completed. The drive may return the interrupt before the seek is
completed. If another command is issued to the drive while a seek is
being executed, the drive sets BSY=1, waits for the seek to complete,
and then begins execution of the command.
Drives with Power Management facilities that are in a low power state
when this command is received may signal completion of this command
without leaving the low power state.
5.4.14 Set Features command
This command (command code EF
H
) is used by the host to establish the
following parameters which affect the execution of certain drive features,
which may or may not be supported by a particular Seagate drive (see
your drive product manual to determine which Set Features codes are
supported by a particular drive). If the value in the Features register is
not supported or is invalid, the drive posts an Aborted Command error.
Byte Description
01
H
Enable 8-bit data transfers
02
H
Enable write cache (see product manual for default settings)
03
H
Set DMA transfer mode based on value in Sector Count register
33
H
Disable retry
50 ATA Interface Reference Manual, Rev. C