READ CAPACITY | 25h |
READ capacity transfers Read Capacity data to the host.
Illegal Field | Fixed Bit | Flag Link | Bad LUN |
Reservation | Deferred Error | Unit Attention |
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If the drive is not in
Command descriptor block:
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| 7 |
| 6 | 5 |
| 4 |
| 3 | 2 | 1 | 0 |
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| 0 |
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| Operation | Code (25h) |
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| 1 |
| Logical Unit Number |
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| Reserved (0) |
| RelAdr(0) | ||
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| 2 | (MSB) |
| Logical Block Address (0) |
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| 5 |
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| 6 |
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| Reserved (0) |
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| 7 |
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| Reserved (0) |
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| 8 |
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| Reserved (0) |
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| PMI | ||
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| 9 |
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| Control |
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CDB fields:
Logical Block Address This flag is ignored. It is recommended that it should be zero.
PMI | This flag is ignored. It is recommended that it should be zero. |
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Read Capacity data
The following data is always returned:
| 7 |
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| 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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0 | (MSB) |
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| Returned Logical Block Address |
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3 |
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| (0004B000h) |
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4 | (MSB) |
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| Block Length in bytes |
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7 |
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| (00000800h) |
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124 Commands