5.3 Host Commands
(20) 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.
The number of ECC bytes to be transferred is fixed to 4 bytes and can not be changed by the SET FEATURES command.
This command is operated under the following conditions:
•READ LONG issued → WRITE LONG (Same address) issues sequence (After READ LONG is issued, WRITE LONG can be issued consecutively.)
If above condition is not satisfied, the WRITE LONG Data becomes the
Uncorrectable error for subsequence READ command.
At command issuance (I/O registers setting contents)
1F7H(CM) | 0 | 0 | 1 | 1 |
| 0 | 0 | 1 | R |
1F6H(DH) | x | L | x | DV |
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1F5H(CH) | Cylinder No. [MSB] / LBA |
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1F4H(CL) | Cylinder No. [LSB] / LBA |
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1F3H(SN) | Sector No. / LBA [LSB] |
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1F2H(SC) | 01 |
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1F1H(FR) | xx |
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At command completion (I/O registers contents to be read)
1F7H(ST) | Status information |
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1F6H(DH) | x |
| L | x | DV | Head No. /LBA [MSB] |
1F5H(CH) | Cylinder No. [MSB] / LBA | |||||
1F4H(CL) | Cylinder No. [LSB] / LBA | |||||
1F3H(SN) | Sector No. / LBA [LSB] | |||||
1F2H(SC) | 00 (*1) |
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1F1H(ER) | Error information |
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*1 If the command is terminated due to an error, this register indicates 01.
