5.3 Host Commands
C141-E057-01EN 5-47
(19) 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.
Number of ECC bytes to be transferred is fixed to 4 bytes and cannot be changed
by the SET FEATURES command.
The READ LONG command supports only single sector operation.
At command issuance (I/O registers setting contents)
1F7H
(CM)
0010001R
1F6H
(DH)
×L×DV
Head No. /LBA [MSB]
1F5H
(CH)
1F4H
(CL)
1F3H
(SN)
1F2H
(SC)
1F1H
(FR)
Cylinder No. [MSB] / LBA
Cylinder No. [LSB] / LBA
Sector No. / LBA [LSB]
01
xx
R = 0 →with Retry
R = 1 →without Retry
At command completion (I/O registers contents to be read)
1F7H
(ST)
Status information
1F6H
(DH)
×L×DV
Head No. /LBA [MSB]
1F5H
(CH)
1F4H
(CL)
1F3H
(SN)
1F2H
(SC)
1F1H
(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.