Hitachi HUS154530VLF400 用户手册
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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19.21 READ CAPACITY (10) - (25)
Table 184: READ CAPACITY (10) - (25)
The READ CAPACITY command returns information regarding the capacity of the drive.
•
Logical Block Address is used in conjunction with the PMI bit.
•
PMI (Partial Medium Indicator) indicates:
PMI Description
0
The drive returns the last LBA of the drive.
1
The drive returns the last LBA and block length in bytes are that of the LBA after which a substantial delay
in data transfer will be encountered. This returned LBA shall be greater than or equal to the LBA specified
by the LBA fields in the CDB.
in data transfer will be encountered. This returned LBA shall be greater than or equal to the LBA specified
by the LBA fields in the CDB.
This option provides the information that the Initiator needs to determine the amount of space available on the same track
that is accessible without a head switch or seek.
that is accessible without a head switch or seek.
Byte
Bit
7
6
5
4
3
2
1
0
0
Command Code = 25h
1
Reserved = 0
Reserved = 0
Obso-
lete
2-5
(MSB)
Logical Block Address
(LSB)
6-7
Reserved = 0
8
Reserved = 0
PMI
9
VU = 0
Reserved = 0
FLAG
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