Page
54
LTO SCSI Interface Manual
Field Descriptions
Field
Bytes
Bits
Description
Mode Data
Length
0-1
Mode Select: Always 0.
Mode Sense: The number of bytes of data available.
WP
3
7
Mode Select: Ignored.
Mode Sense: 0 = The cartridge is not write protected.
1 = the cartridge is write protected.
Buffered
Mode
3
4-6
0 = Unbuffered mode.
1 = Buffered mode (default).
Speed
3
0-3
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
Block
Descriptor
Length
6-7
0 = No Block Descriptor follows.
8 = 8-byte Block Descriptor follows.
Reserved
All reserved bits must be 0.
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.
Block Descriptor
The following table presents the Parameter List block descriptor.
Byte
Bits
7
6
5
4
3
2
1
0
0
Density Code
1
Reserved
2
Reserved
3
Reserved
4
Reserved
5
Block Length, MSB
6
Block Length
7
Block Length, LSB
Field Descriptions
Field
Bytes
Bits
Description
Density
Code
0
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
Block
Length
5-7
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.
Reserved
All reserved bits must be 0.
