Seagate MEDALIST 1080SL Product Manual page 54

44 Medalist 1080sl SCSI Product Manual, August 1995
Byte 1 The page format (PF) bit is always one. This means that the data
sent by the initiator after the mode select header and block
descriptors complies with the page format.
When the save pages (SP) bit is 1, the drive saves the saveable
pages in nonvolatile memory.
When the save pages (SP) bit is 0, the drive saves the saveable
pages in RAM only, which means that the parameters are lost
when the drive is powered down.
Byte 4 The parameter list length specifies the length, in bytes, of the
header and mode page transferred to the drive. A parameter list
length of 0 means that no data is transferred. To calculate the
parameter list length for any given mode page, add the parame-
ter list header (4 bytes), the block descriptor (if any, 8 bytes), the
2-byte mode page header and the length of each mode page.
For the lengths of the mode pages, refer to Appendix C.
3.4.10.1 Mode Select parameter list
The Mode Select parameter list contains a 4-byte header, followed by a
1-block descriptor (if any), followed by the Mode Select parameter pages.
Each block descriptor specifies the media characteristics for all or part
of a logical unit. The rest of the Mode Select parameters are grouped by
function and organized into mode pages. The mode pages are described
in Appendix C.
Bytes
7 6
0 (default)
1 (default)
2 (default)
3 (default) Block descriptor length (00
4 (default)
5–7
8 (default)
9–11
12– n
Bits
5 4 3 2
Parameter list header
Reserved (00 )
H
Medium type (00 )
H
Reserved (00 )
H
or 08
H
Block descriptor data
Density code (00 )
H
Number of blocks
Reserved (00 )
H
Block length
Parameter information
Mode pages
1 0
)
H