Fujitsu MAN3735 Manuale Utente
C141-E124-01EN
3 - 14
3.1.3
READ CAPACITY (25)
Bit
Byte
Byte
7
6
5
4
3
2
1
0
0
X‘25’
1
LUN
0
0
0
0
0
2
Logical Block Address (MSB)
3
Logical Block Address
4
Logical Block Address
5
Logical Block Address (LSB)
6
0
0
0
0
0
0
0
0
7
0
0
0
0
0
0
0
0
8
0
0
0
0
0
0
0
PMI
9
0
0
0
0
0
0
Flag
Link
This command transfers information related to the disk drive's capacity and the data block size to
the INIT.
the INIT.
When bit 0 "PMI (partial medium indicator)" of CDB byte 8 is "0," the logical block address and
block length (byte length) of the final data block which is accessible in the disk drive (user space)
are transferred to the INIT. At this time, the "Logical Block address" field in the CDB must
specify zero.
block length (byte length) of the final data block which is accessible in the disk drive (user space)
are transferred to the INIT. At this time, the "Logical Block address" field in the CDB must
specify zero.
When the "PMI" bit is "1," the logical block address and block length (byte length) of data blocks
which satisfy either of the following conditions is transferred to the INIT.
which satisfy either of the following conditions is transferred to the INIT.
x The data block on the cylinder where the specified block exists, which is just before the block
where the first alternate sector processing (not including defective block sector slip processing)
is implemented. However, when alternate sector processing is being implemented in the
specified block, the data block specified in the CDB.
is implemented. However, when alternate sector processing is being implemented in the
specified block, the data block specified in the CDB.
x When no alternate sector processed data block exists in the cylinder where the specified block
exists, the last data block in that cylinder.