10.8.9 Read Verify (40h)
COMMAND CODE | 0 1 0 0 0 0 0 0 | REGISTER | |
| REGISTER SETTING | NORMAL COMPLETION | |
DR | drive no. | no change | |
CY | starting cylinder | last possible | |
HD | starting head | last possible | |
SN | starting sector | start sector | |
SC | no. of sector to be read | 00H | |
LBA | starting address | last address | |
This command is identical to a Read command except that the drive has read the data from the media, and the DRQ bit is not set and no data is sent to the host. This allows the system to verify the integrity of the drive. A single interrupt is generated upon completion of a command or when an error occurs.
10.8.10 Read Verify EXT | (42h) |
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| COMMAND CODE |
| 0 1 0 0 0 0 1 0 |
| REGISTER | |||
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| REGISTER SETTING | NORMAL COMPLETION | |||
| DR |
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| drive no. |
| no change | |
| LBA | Current |
| LBA(7:0) | HOB=0 |
| last address | |
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| Low | Previous |
| LBA(31:24) | HOB=1 |
| last address | |
| LBA | Current |
| LBA(15:8) | HOB=0 |
| last address | |
| Mid | Previous |
| LBA(39:32) | HOB=1 |
| last address | |
| LBA | Current |
| LBA(23:16) | HOB=0 |
| last address | |
| High | Previous |
| LBA(47:40) | HOB=1 |
| last address | |
| SC | Current |
| sector count(7:0) | HOB=0 |
| 00H | |
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| Previous |
| sector count(15:8) | HOB=1 |
| 00H | |
| FT | Current |
| reserved | HOB=0 |
| no change | |
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| Previous |
| reserved | HOB=1 |
| no change | |
This command is identical to a Read EXT command except that the drive has read the data from the media, and the DRQ bit is not set and no data is sent to the host. This allows the system to verify the integrity of the drive. A single interrupt is generated upon completion of a command or when an error occurs.
This command is available in LBA addressing only.
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