Mode Data Format
Mode data returned by a MODE SENSE command or sent with a MODE SELECT
command consists of a Mode Parameter Header, an optional Mode Block
Descriptor, and zero or more Mode Parameter Pages.
Table 30. Mode Data Format
7
6
5
4
3
2
1
0
0
:
3
Mode Parameter Header
4
:
11
Mode Block Descriptor
12
:
n
Mode Parameter Pages
Mode Parameter Header
Table 31. Mode Parameter Header 6-Byte Command
7
6
5
4
3
2
1
0
0
Mode Data Length
1
Medium Type (0)
2
WP
Buffered Mode
Speed (0)
3
Block Descriptor Length
Table 32. Mode Parameter Header 10-Byte Command
7
6
5
4
3
2
1
0
0
Mode Data Length
1
2
Medium Type (0)
3
WP
Buffered Mode
Speed (0)
4
Reserved
5
Reserved
6
Block Descriptor Length
7
In a MODE SENSE command, the Mode Data Length indicates the total amount of
data available to be transferred. In a MODE SELECT command, this field is 0.
The Medium Type field is not used and should be set to 0.
The Write Protect flag indicates whether the currently loaded tape is write protected
in a MODE SENSE command. It is ignored in a MODE SELECT command.
28
Ultrium Internal Tape Drive and 3580 Ultrium Tape Drive: SCSI Reference
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