Pioneer SCSI-2 - Manual (Page 46)

Mode Sense(6)
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Number of blocks
The value 0 means that the length of all blocks is same as the Logical Block Length shown
in the block descriptor.
Logical Block Length
Indicates the logical block size in bytes. In the current version, 256, 512, 1024,
2048(default), 2052, 2336, 2340 and 2352 byte are supported. The default values for the
CD-ROM drives (512 or 2048) are selectable with an external switch.
Density Code
01h : User data only (2048 bytes/physical sector)(default)
02h : User data plus auxiliary data (2336 bytes/physical sector)
03h : Header, user data plus auxiliary data (2340 bytes/physical sector)
04h : Audio data only (1/75th of a second per logical block)
05h~FFh : Reserved
The drive will return Allocation Length bytes or the complete sense data.
Each page descriptor starts with a 2-byte header consisting of the page code and page length, and
the specified page data follow the header.
Page code indicates the meaning of the data contained in the page.
Page length does not include the page length byte itself. The page length indicates the number of
bytes supported for each page.