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C141-E090-01EN5 - 40
The READ LONG command supports only single sector operation.
At command issuance (I/O registers setting contents)
1F7
H
(CM) 0 0 1 0 0 0 1 R
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:
• The command is issued in a sequence of the READ LONG or WRITE LONG (to the same
address) command issuance. (WRITE LONG command can be continuously issued after
the READ LONG command.)
If above condition is not satisfied, the command operation is not guaranteed.