Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Mode Sense (Group 0) Command (1AH)
Chapter 22-60
Caching Page 08H
PS The Parameters Savable bit of 1 indicates this
parameter page is savable in non-volatile RAM.
WCE A Write Cache Enable bit of 1 indicates write caching is
enabled.
A WCE bit of 0 indicates write caching is disabled.
MF The Multiplication Factor bit is set to 1 and cannot be
changed. This bit is set to the Minimum and Maximum
Pre-Fetch fields during READ operations. If this bit is
set to 0 by the MODE SELECT command, a CHECK
CONDITION status is returned with the sense key/
additional sense code set to ILLEGAL REQUEST/
Invalid Parameter List.
Table 2-53 Caching Page 08H
Byte 7 6 5 4 3 2 1 0
0 PS
(1)
Rsvd
(0)
Page Code (08H)
1 Page Length (0AH)
2 Reserved (0) WCE MF RCD
3 Reserved (0)
4 Disable Pre-fetch Transfer Length (MSByte)
5 Disable Pre-fetch Transfer Length (LSByte)
6 Minimum Pre-fetch (MSByte)
7 Minimum Pre-fetch (LSByte)
8 Maximum Pre-fetch (MSByte)
9 Maximum Pre-fetch (LSByte)
10 Maximum Pre-fetch Ceiling Length (MSByte)
11 Maximum Pre-fetch Ceiling Length (LSByte)