Seagate Viper 200, Scsi Interface Manual

Page: 76 / 136

SCSI Commands Page
67
Field Descriptions
Field Bytes Bits Description
Mode Data
Length 0 Mode Select: Always 0.
Mode Sense: The number of bytes of data available.
Medium
Type 1 Identifies the type of media currently in the drive.
0 = Data Cartridge
1 = Cleaning Cartridge
WP 2 7 Mode Select: Ignored.
Mode Sense: 0 = The cartridge is not write protected.
1 = the cartridge is write protected.
Buffered
Mode 2 4-6 0 = Unbuffered mode.
1 = Buffered mode (default).
Speed 2 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 3 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.
10-Byte CDB Mode Parameter Header
Byte
Bits
7 6 5 4 3 2 1 0
0 – 1 Mode Data Length
2
Medium Type
3 WP Buffered Mode Speed
4 Reserved
5 Reserved
6 Block Descriptor Length, MSB
7 Block Descriptor Length, LSB
Field Descriptions
Field Bytes Bits Description
Mode Data
Length 0-1 Mode Select: Always 0.
Mode Sense: The number of bytes of data available.
Medium
Type 1 Identifies the type of media currently in the drive.
0 = Data Cartridge
1 = Cleaning Cartridge
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).