Some info on 2064 bytes/sector RAW DVD dumping:
Apparently, what LG drives do is, they read the buffer of the drive in order to get the RAW contents of a DVD. There are 2 tools for LG drives that can do this and one tool that works on Plextor drives (and also on several other drives?)!
Here's a tool by Truong that you can use to test the command on Plextor (and other?) drives. First, you have to read a sector the normal way (e.g. with isobuster), and then you can use this tool to save the buffer: http://vigi.dremora.com/rawdvd/readbuf_dump.zip.
If you have an LG drive, try one of the following tools instead (and use the different program name in the example):
Newer drives: http://vigi.dremora.com/rawdvd/ren_hit_lg_dump.zip
Older drives: http://vigi.dremora.com/rawdvd/hit_dump.zip
readbuf_dump <drive letter> <output file> <start offset> <len>
'readbuf_dump d mem.bin 0 235200' dumps the first 100 CD (2352-byte) sectors from the D: drive buffer
'readbuf_dump d mem.bin 0 206400' dumps the first 100 DVD (2064-byte) sectors from the D: drive buffer
Unfortunately you can't use this tool to dump complete cd's, so we're working on a solution for that!
Many thanks again to Truong for the tools..