IBM IC35L036UWDY10 Hard Drive Specifications - Page 148

READ CAPACITY 25h, Reserved = 0, VU = 0, Logical Block Address, RelAdr, Command Code = 25h

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8.18 READ CAPACITY (25h) Byte 0 1 2 3 4 5 6 7 8 9 Bit 7 6 5 4 3 2 Command Code = 25h Reserved = 0 Reserved = 0 (MSB) Logical Block Address 1 0 RelAdr =0 (LSB) VU = 0 Reserved = 0 Reserved = 0 Reserved = 0 PMI FLAG LINK Figure 127. READ CAPACITY The READ CAPACITY command returns information regarding the capacity of the drive. ! Logical Block Address is used in conjunction with the PMI bit. ! RelAdr A Relative Address is not supported. Must be set to zero. ! PMI Partial Medium Indicator indicates PMI Description 0 The drive returns the last logical block address of the drive. 1 The drive returns the last logical block address and block length in bytes are that of the logical block address after which a substantial delay in data transfer will be encountered. This returned logical block address shall be greater than or equal to the logical block address specified by the logical block address fields in the command descriptor block. This option provides the information which the initiator needs to determine the amount of space available on the same track which is accessible without a head switch or seek. Ultrastar 146Z10 hard disk drive specifications 132

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8.18 READ CAPACITY (25h)
LINK
FLAG
Reserved = 0
VU = 0
9
PMI
Reserved = 0
8
Reserved = 0
6
7
(MSB)
Logical Block Address
(LSB)
2
3
4
5
RelAdr
=0
Reserved = 0
Reserved = 0
1
Command Code = 25h
0
0
1
2
3
4
5
6
7
Bit
Byte
Figure 127. READ CAPACITY
The READ CAPACITY command returns information regarding the capacity of the drive.
!
Logical Block Address
is used in conjunction with the PMI bit.
!
RelAdr
A Relative Address is not supported. Must be set to zero.
!
PMI
Partial Medium Indicator indicates
PMI
Description
0
The drive returns the last logical block address of the drive.
1
The drive returns the last logical block address and block length in bytes are that of the
logical block address after which a substantial delay in data transfer will be encountered.
This returned logical block address shall be greater than or equal to the logical block
address specified by the logical block address fields in the command descriptor block.
This option provides the information which the initiator needs to determine the amount of
space available on the same track which is accessible without a head switch or seek.
Ultrastar 146Z10 hard disk drive specifications
132