(18)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.
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 | ||
|
|
|
|
|
|
|
|
| |||
1F6H(DH) | × | L |
| × |
| 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) |
|
| Number of sectors to be transferred |
| |||||||
1F1H(FR) |
|
|
|
|
|
| xx |
|
|
| |
R = 0 or 1
At command completion (I/O registers contents to be read)
1F7H(ST) |
|
|
| Status information | |||
|
|
|
|
|
|
|
|
1F6H(DH) | × | L |
| × |
| 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) | |
1F1H(ER) |
|
|
| 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.
| 5 - 41 |
