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SCSI Commands
Mode Parameter Header
6-Byte CDB Mode Parameter Header
Field Descriptions
10-Byte CDB Mode Parameter Header
Bits
Byte
7
6
0
1
WP
Buffered Mode
2
3
Field
Bytes
Bits
Mode Data
0
Length
WP
2
7
Buffered
2
4-6
Mode
Speed
2
0-3
Block
3
Descriptor
Length
Reserved
When Buffered Mode is 1, a Write command is terminated when the data is
transferred to the internal buffer of the drive. When Buffered Mode is 0 a Write
command is not terminated until all data has been transferred to tape.
Bits
Byte
7
6
0
1
2
3
WP
Buffered Mode
4
5
6
7
5
4
3
Mode Data Length
Reserved
Speed
Block Descriptor Length
Description
Mode Select: Always 0.
Mode Sense: The number of bytes of data available.
Mode Select: Ignored.
Mode Sense: 0 = The cartridge is not write protected.
1 = the cartridge is write protected.
0 = Unbuffered mode.
1 = Buffered mode (default).
This field indicates the tape speed.
0 = Default
3 = 2.077 m/sec (meter/second)
4 = 2.576 m/sec
5 = 3.097 m/sec
6 = 3.643 m/sec
7 = 4.153 m/sec
0 = No Block Descriptor follows.
8 = 8-byte Block Descriptor follows.
All reserved bits must be 0.
5
4
3
Mode Data Length, MSB
Mode Data Length, LSB
Reserved
Speed
Reserved
Reserved
Block Descriptor Length, MSB
Block Descriptor Length, LSB
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2
1
0
2
1
0
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