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ATAPI Interface Chapter 5
Seagate Travan 40 Product Manual Page 63
Speed Code: Speed code values are listed in the table below. The Speed Code may
be set explicitly by MODE SELECT command, or implicitly when AVC ( Auto-
Throttle) is set to 1 (bit 4, byte 8 of page code 10h). If AVC is set to 1, MODE SENSE
will report the actual speed selected to optimize data throughput.
Code Meaning
0h Use default speed.
1h Use lowest tape speed.
2h-Fh Use highest tape speed
Block Descriptor Length: Specifies the number of bytes in the Block Descriptor.
This value is 08.
Block Descriptor
Data Bits
Byte 7 6 5 4 3 2 1 0 Hex
0 Density Code XXh
1
2
3
MSB
Number Of Blocks
LSB
00
00
00
4 0 0 0 0 0 0 0 0 00
5
6
7
MSB
Block Length
LSB
XX
XX
XX
Density Code: This byte identifies the bit density and format of the media used by
the drive. The value returned by this field is determined by the last MODE SELECT
command, or is the default value based on cartridge type and/or previously recorded
density following a power-up reset.
Density Code QIC Reference Read Write
46 Travan
5, QIC-3220-MC Yes No
*** Travan
40 Yes Yes
Number of Blocks: This field must be 0.
Block Length: This field indicates the selected block length and mode. The
STT3401A default block length is 512 bytes. The maximum fixed block length is
1024 bytes.
Parameters: MODE Sense Data pages are as specified in the MODE SELECT
commands. See Section 0 for page, field, and bit specifications.