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Page 54
Field Descriptions
Block Descriptor
Field Descriptions
Field
Bytes
Bits
Mode Data
0-1
Length
WP
3
7
Buffered
3
4-6
Mode
Speed
3
0-3
Block
6-7
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.
The following table presents the Parameter List block descriptor.
Bits
Byte
7
6
0
1
2
3
4
5
6
7
Field
Bytes
Bits
Density
0
Code
Block
5-7
Length
Reserved
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
Density Code
Reserved
Reserved
Reserved
Reserved
Block Length, MSB
Block Length
Block Length, LSB
Description
Identifies the format of the tape currently in the drive.
Mode Select: 00h = Default of Ultrium 1
40h = Ultrium 1
7Fh = No-op
Mode Sense: 00h = Default of Ultrium 1
0 = Variable length block mode. The Fixed bit in Read and Write
commands must be 0.
1 to FFFFFFh = The length of the fixed-length block to be read or
written when the Fixed bit is set in a Read or Write command.
All reserved bits must be 0.
LTO SCSI Interface Manual
2
1
0
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