Specifications

8.17 READ BUFFER (ACH)
LINKFLAGReserved = 0VU=09
(MSB)
Allocation Length
(LSB)
6
7
8
(MSB)
Buffer Offset
(LSB)
3
4
5
Buffer ID = 02
ModeReserved = 01
Command Code = 3Ch0
01234567
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
129