5.19READ (10) Command (28h)
The READ (10) command requests that data be transferred from the drive to the initiator. The amount of data transferred is specified by the transfer length field. The starting point is specified by the logical sector address. The data format and field descriptions are shown in Table
Table
Byte | Bit | 7 | 6 | 5 | 4 |
| 3 | 2 |
| 1 | 0 |
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0 |
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| Operation | Code (28h) |
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1 |
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| Reserved |
| DPO |
| FUA |
| Reserved | RelAdr | |
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2 - 5 |
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| Logical Block Address |
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6 |
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| Reserved |
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7 - 8 |
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| Transfer Length |
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9 |
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| Control |
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Table | ||
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Field | Description | |
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| Disable Page Out. When the value is 0, the drive caches the data read, using its normal | |
DPO | Logical Read Unit policies. | |
When the value is 1, the drive assigns to logical blocks accessed by the READ (10) | ||
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| command the lowest priority for being fetched into or retained by the cache. | |
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| Force Unit Access. When the value is 0, the drive is allowed to satisfy the read with | |
FUA | ||
A value of 1 indicates that the drive accesses the media in performing the command | ||
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| before returning GOOD status. | |
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RelAdr | Relative Addressing. The drive does not support relative addressing. Must be 0 | |
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Logical Block Address | Specifies the logical sector address where the read operation will begin. | |
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| Specifies the number of contiguous logical blocks of data to transfer. A transfer length | |
| of 0 indicates that no logical blocks are to be transferred. | |
Transfer Length | Any other value indicates the number of logical blocks to be transferred. The drive | |
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| returns a CHECK CONDITION status with the correct sense data if the specified | |
| transfer extends beyond the logical sector space. | |
Maxtor Atlas 10K V |