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C141-E034-02EN5 - 22
At command completion (I/O registers contents to be read)
1F7
H
(ST) Status information
1F6
H
(DH)
×
L
×
DV End head No. /LBA [MSB]
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(ER)
End cylinder No. [MSB] / LBA
End cylinder No. [LSB] / LBA
End sector No. / LBA [LSB]
00 (*1)
Error information
*1 If the command is terminated due to an error, the remaining number of
sectors of which data was not transferred is set in this register.
(5) WRITE SECTOR(S) (X'30' or X'31')
This command writes data of sectors from the address specified in the Device/Head, Cylinder
High, Cylinder Low, and Sector Number registers to the address specified in the Sector Count
register. Number of sectors can be specified to 256 sectors in maximum. Data transfer begins at
the sector specified in the Sector Number register. For the DRQ, INTRQ, and BSY protocols
related to data transfer, see Subsection 4.4.2.
If the head is not on the track specified by the host, the device performs a implied seek. After the
head reaches to the specified track, the device writes the target sector.
When the command is specified with retry or without retry, the device attempts to retry up to 16
times.
The data stored in the buffer, and CRC code and ECC bytes are written to the data field of the
corresponding sector(s). Upon the completion of the command execution, the command block
registers contain the cylinder, head, and sector addresses of the last sector written.
If an error occurs during multiple sector write operation, the write operation is terminated at the
sector where the error occurred. Command block registers contain the cylinder, the head, the
sector addresses (in the CHS mode) or the logical block address (in the LBA mode) of the sector
where the error occurred. Then the host can read the command block registers to determine what
error has occurred and on which sector the error has occurred.
At command issuance (I/O registers setting contents)
1F7
H
(CM) 0011000R
1F6
H
(DH)
×
L
×
DV Start head No. /LBA [MSB]
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(FR)
Start cylinder No. [MSB] / LBA
Start cylinder No. [LSB] / LBA
Start sector No. / LBA [LSB]
Transfer sector count
xx
R = 0 →with Retry
R = 1 →without Retry