Mode Parameter Header
The returned data on a Mode Sense (10) command begins with an eight byte Mode Parameter Header.
This header has the following structure:
Bit 7 6 5 4 3 2 1 0
Byte
0 (MSB) Mode Data Length
1 (LSB)
2 Reserved
3 Reserved
4 Reserved
5 Reserved
6 (MSB) Block Descriptor Length
7 (LSB)
Field descriptions:
Mode Data Length:
This field indicates the number of bytes of parameter information the media changer is returning
as a result of this command, excluding the Mode Data Length but including the six additional
Mode Parameter Header bytes. If a block descriptor was requested this count is also added to the
Mode Data Length.
Block Descriptor Length:
When the DBD bit is set to zero the media changer may return an eight byte Block Descriptor.
When a Block Descriptor is returned the Block Descriptor Length will report 8. When the DBD bit
is set the media changer will not return Block Descriptors and the block Descriptor Length will
report 0.
3-40 TL2000 and TL4000 SCSI Reference
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