Quantum DLT 8000 Product Manual page 327

REPORT DENSITY SUPPORT Command (44h) (continued)
Table 5-84 Density Support Data Block Descriptor — Field Descriptions
Data Field
Primary Density
Code
Secondary
Density Code
WRTOK
DUP
DEFLT
Description
This field contains the value returned by a MODE SENSE command for the
density described in the remainder of the Density Support Data Block
Descriptor. Allowable Density Codes for the tape system are shown in Table
(To Be Supplied).
When multiple density code values are assigned to the same recording
technology, this field lists the equivalent density code value. If no secondary
density code exists, the device server returns the primary device code value
in this field.
Write OK. When this bit = 0, it indicates that the drive does not support
writing to the media with this density.
When this bit = 1, it indicates that the drive is capable of writing this
density to either the currently mounted medium (if Media bit in the
Command Block Descriptor = 1) or for some media (if Media bit in the
Command Block Descriptor = 0). Note that all density code values returned
by the Report Density Support command are supported for READ
operations.
Duplicated. When this bit = 0, it indicates that this Primary Density Code
has exactly one density support data block.
When this bit = 1, it indicates that this Primary Density Code is specified in
more than one density support data block.
Default. When this bit = 0, it indicates that this is not the default density of
the tape drive.
If either the Primary Density Code or the Secondary Density Code is 0, the
DEFLT bit will be 1. If neither the Primary or Secondary Density Code is 0
and DEFLT is 1, the logical unit will accept a MODE SELECT header with a
density code of 00h as equivalent to the Primary and Secondary Density
Codes.
NOTE: The default density of the logical unit may vary depending on the
currently mounted media. Multiple codes may return a DEFLT bit of 1 when
the Media bit is 0 since more than one default may be possible.
Quantum DLT 8000 Tape System
SCSI Commands
(continued)
5-183