
4.6 Packet Commands
Table 4.83 READ CAPACITY data
Bit | 7 | 6 | 5 |
| 4 | 3 |
| 2 | 1 | 0 |
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| Last Logical Block Address |
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| Block Length in Bytes |
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Last Block Address specifies LBA of the last accessible block.
Block Length in Bytes indicates the number of bytes per block.
4.6.11READ FORMAT CAPACITIES command
Table 4.84 READ FORMAT CAPACITIES command
Bit | 7 | 6 | 5 |
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| 2 | 1 | 0 |
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0 |
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| Operation Code (23h) |
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1 |
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| Allocation Length |
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The READ FORMAT CAPACITIES command transfers data on the capacity of media currently loaded to the host. If no media is loaded, this command returns the maximum capacity value of supported media to the host.
Table 4.85 READ FORMAT CAPACITIES data format
Bit | 7 | 6 |
| 5 |
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| 2 | 1 | 0 |
Byte |
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| Capacity List Header |
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| Current / Maximum Capacity Descriptor |
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| Table 4.86 Capacity list header |
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Bit | 7 | 6 |
| 5 |
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| 2 | 1 | 0 |
Byte |
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| Reserved |
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3 |
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| Capacity List Length (8h) |
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