Read Capacity (25) - Hitachi HUS151473VL3800 - Ultrastar 73.4 GB Hard Drive Specifications

17.18 READ CAPACITY (25)

Table 114: READ CAPACITY (25)
Byte
7
0
1 Reserved = 0
(MSB)
2-5
6-7
8
9 VU = 0
The READ CAPACITY command returns information regarding the capacity of the drive.
• Logical Block Address is used in conjunction with the PMI bit.
• RelAdr (Relative Address) is not supported. Must be set to zero.
• 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.
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.
Hitachi Confidential
6 5 4
Command Code = 25h
Logical Block Address
Reserved = 0
Reserved = 0
Reserved = 0
Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
Bit
3 2
Reserved = 0
162
1 0
RelAdr
= 0
(LSB)
PMI
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