Reference Guide

Chapter 4 SCSI Commands
MODE SELECT (6) / (10) Command (15h / 55h)
DLT-S4 Interface Reference Guide 143
Table 85 Medium
Configuration Mode Page —
Field Descriptions
Field Description
PS Parameters Savable. For
MODE SELECT, must be set to 0.
SPF SubPage Format. Always set to 0. Indicates that this page uses the page_0 page
format.
Page Code Identifies the type of
MODE SELECT page being transferred. A value of 1Dh
identifies this as the Medium Configuration Mode Page.
Page Length Indicates the number bytes in the page, excluding bytes 0 and 1. The length is
returned in
MODE SENSE commands and must subsequently be set to the same
value when performing
MODE SELECT.
WORMM The
WORM mode (WORMM) bit is set to one when the device server is operating in
WORM mode, no medium is mounted, or the current medium is not a WORM
medium (see SSC-3). The WORMM bit is set to zero when the device server is not
operating in
WORM mode or when the current medium is a WORM medium. This bit
is not changeable with a
MODE SELECT command.
WORM MODE
LABEL
RESTRICTIONS
The field specifies the restrictions against overwriting format labels when operating
in
WORM mode. A series of filemarks with no interleaved logical blocks immediately
preceding EOD is treated as a filemark sequence and is controlled by the
WORM
MODE FILEMARKS RESTRICTIONS
field.
The DLT-S4 supports only a setting of 00h indicating that it will not allow any
logical blocks to be over-written on a WORM medium.
WORM MODE
FILEMARKS
RESTRICTIONS
The
WORM MODE FILEMARKS RESTRICTIONS field specifies the restrictions against
overwriting a series of filemarks immediately preceding EOD when operating in
WORM mode. The WORM MODE FILEMARKS RESTRICTIONS field controls only the
overwriting of a series of filemarks with no interleaved logical blocks immediately
preceding EOD.
The DLT-S4 supports only a setting of 03h indicating that it will allow any number
of filemarks immediately preceding EOD to be over-written.