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Host Interface
4-66 C156-E227-01EN
When 0 is specified as Transfer Length, data is not transferred. The command
ends normally without executing Read processing.
4.6.11 READ CAPACITY command
Table 4.83 READ CAPACITY command
Bit
Byte
76543210
0 Operation Code (25h)
1 Logical Unit Number Reserved
2-7 Reserved
8ReservedPMI
9-11 Reserved
The READ CAPACITY command transfers data on the media capacity to the host.
Table 4.84 lists the data transferred if the Partial Medium Indicator (PMI) bit is 0.
Table 4.84 READ CAPACITY data (PMI=0)
Bit
Byte
76543210
0-3 Last Logical Block Address
4-7 Block Length in Bytes
Last Logical Block Address indicates the LBA of the last accessible block.
Block Length in Bytes indicates the number of bytes per block.
When the Partial Medium Indicator (PMI) bit is 1, the data to be transferred
depends on the type of media. Tables 4.85 and 4.86 list the data transferred for
two types of media.
Table 4.85 READ CAPACITY data (PMI=1, MO media, FROM medium)
Bit
Byte
76543210
0-3 Last Logical Block Address
4-7 Block Length in Bytes