8.17 READ BUFFER (ACH)
LINK
FLAG
Reserved = 0
VU = 0
9
(MSB)
Allocation Length
(LSB)
6
7
8
(MSB)
Buffer Offset
(LSB)
3
4
5
Buffer ID = 0
2
Mode
Reserved = 0
1
Command Code = 3Ch
0
0
1
2
3
4
5
6
7
Bit
Byte
Figure 123. READ BUFFER
!
READ BUFFER command is used in conjunction with the WRITE BUFFER command as a diagnostic
function for testing the memory of the drive and the SCSI bus integrity. This command does not alter
the medium.
The function of this command and the meaning of fields within the command descriptor block depend
on the contents of the mode field:
MODE Description
0000
Read Combined Header and Data
0010
Data
0011
Descriptor
1010
Read Data from Echo Buffer
1011
Echo Buffer Descriptor
All others
Not supported.
Ultrastar 146Z10 hard disk drive specifications
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