Quantum DLT1/VS80 SCSI, Interface Manual

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Chapter 4: SCSI Commands
4-70 July 2004 81-81276-01 Rev A01
The MODE SENSE (10) data contains an 8-byte header followed by one 8-byte block descriptor,
followed by zero or more variable length pages.
Figure 4-45.
MODE SENSE (10) Data Header — Data Format
Bit
Byte
7 6 5 4 3 2 1 0
0 - 1
(MSB)
Mode Sense Data Length
(LSB)
2 Media Type
3 WP Buffered Mode Speed (0)
4 - 5 Reserved
6 - 7
(MSB)
Block Descriptor Length (8)
(LSB)
Table 4-40. MODE SENSE (6/10) Data Header— Field Descriptions
Field Name Description
Mode Sense Data
Length This field specifies the length, in bytes, of the following MODE SENSE data that
is available to be transferred during the DATA IN phase. Mode Sense Data Length
does not include itself.
Media Type The following list shows the media type as determined by the tape drive:
Type
00h
81h
85h
Description
Unknown or media not present
Cleaning Medium
DLTtape IV
WP Write-Protected. When set to 0, this bit indicates that the medium is write-enabled.
When set to 1, this bit indicates that the medium is write-protected.
Buffered Mode The tape drive implements Immediate Reporting on WRITE commands through
Buffered Mode.
When set to 0, the tape drive does not report a GOOD status on WRITE commands
until the data blocks are actually written to medium. When set to 1, the tape drive
reports GOOD status on WRITE commands as soon as the tape drive has
transferred the data block to the buffer. This is the default configuration for the
tape drive. If not using Buffered Mode, the tape drive suffers a degradation in
performance, but not capacity.