Pioneer SCSI-2 - Manual (Page 76)

Logical Unit Assignment Page
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2.9.9 Logical Unit Assignment Page
Number of supported discs
The drive supports 6 discs. 0006h is always returned, and 124x will return 1 .
Disc numbers
Shows the disk number assigned to each logical unit. Disc number 0 means that the
associated logical unit cannot be used. Disc numbers in defaults are 1 through 6 for
logical units 0 through 5, respectively.
Accessing, with other SCSI commands, a logical unit to which disc number 0 has been
assigned results in a Check Condition status with the sense data of "Illegal logical unit
number."
This page shows the parameters of the drive. The logical unit number specified in the
command descriptor block is ignored.