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C141-E112-01EN 5 - 41
(17) FORMAT TRACK (X'50')
Upon receipt of this command, the device sets the DRQ bit and waits the completion of 512-byte
format parameter transfer from the host system. After completion of transfer, the device clears the
DRQ bits, sets the BSY bit. However the device does not perform format operation, but the drive
clears the BYS bit and generates an interrupt soon. When the command execution completes, the
device clears the BSY bit and generates an interrupt.
The drive supports this command for keep the compatibility with previous drive only.
(18) READ LONG (X'22' or X'23')
This command operates similarly to the READ SECTOR(S) command except that the device
transfers the data in the requested sector and the ECC bytes to the host system. The ECC error
correction is not performed for this command. This command is used for checking ECC function
by combining with the WRITE LONG command.
The READ LONG command supports only single sector operation.
At command issuance (I/O registers setting contents)
1F7
H
(CM) 0010001R
1F6
H
(DH)
×
L
×
DV Head No. /LBA [MSB]
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(FR)
Cylinder No. [MSB] / LBA
Cylinder No. [LSB] / LBA
Sector No. / LBA [LSB]
Number of sectors to be transferred
xx
R = 0 or 1
At command completion (I/O registers contents to be read)
1F7
H
(ST) Status information
1F6
H
(DH)
×
L
×
DV Head No. /LBA [MSB]
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(ER)
Cylinder No. [MSB] / LBA
Cylinder No. [LSB] / LBA
Sector No. / LBA [LSB]
00 (*1)
Error information
*1 If the command is terminated due to an error, this register indicates 01.
(19) WRITE LONG (X'32' or X'33')
This command operates similarly to the READ SECTOR(S) command except that the device
writes the data and the ECC bytes transferred from the host system to the disk medium. The
device does not generate ECC bytes by itself. The WRITE LONG command supports only single
sector operation.
This command is operated under the following conditions: