Fujitsu MCE3130AP READ CAPACITY command .79 READ CAPACITY command, 80 READ CAPACITY data PMI =

When Transfer Length is 0, the command does not carry out data transfer. It simply ends normally without reading any data.

It is recommended that the READ (10) command is used because there is ATAPI device which does not support the READ (12) command.

4.6.10READ CAPACITY command

Table 4.79 READ CAPACITY command

Bit	7		6	5	4	3	2	1	0
Byte
0					Operation Code (25h)
1		Logical Unit Number					Reserved
2-7					Reserved
8					Reserved				PMI
9-11					Reserved

The READ CAPACITY command transfers data on the media capacity to the host.

Table 4.80 lists the READ CAPACITY data (PMI =0) to be transferred when the PMI (Partial Medium Indicator) bit is 0.

Table 4.80 READ CAPACITY data (PMI = 0)

Bit	7	6	5		4	3	2	1	0
Byte
0-3				Last Logical Block Address
4-7					Block Length in Bytes

Last Block Address specifies LBA of the last accessible block.

Block Length in Bytes indicates the number of bytes per block.

When the PMI (Partial Medium Indicator) bit is 1, the data transferred depends on the type of media used. Transfer data for each type of media is listed in Tables 4.81 and 4.82.

Table 4.81 READ CAPACITY data (PMI = 1, MO media, FROM media)

Bit	7	6	5		4	3	2	1	0
Byte
0-3				Last Logical Block Address
4-7					Block Length in Bytes

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