Interface
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) | 0 | 0 | 1 | 0 |
| 0 | 0 | 1 | R |
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1F6H(DH) | × | L | × | DV |
| Head No. /LBA [MSB] | |||
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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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R= 0 →with Retry R = 1 →without Retry
At command completion (I/O registers contents to be read)
1F7H(ST) | Status information |
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1F6H(DH) | × |
| L | × | DV | Head No. /LBA [MSB] |
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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.
(18) 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.
