As requested i did a lowd of scans with my pretty new 1640 and the results are as follows;
Pointers: used the same computer, latest version of DVD Decryptor and the latest firmware at the time. The disc types where chosen as the ones i could get my hands on in the UK for less money than for a Verbatim disc. All discs where written at 2.4x except the Verbatim which was at 8x (see http://club.cdfreaks.com/attachment.php?attachmentid=33425&stc=1 for a 2.4x recording by someone else). All the images burnt are different and where all over 4.5gb including the the RiDisc which died durring the write.
All discs were verified as correct and all work on my DVD player (of course excluding the RiDisc piece of junk)
PS we got a dumping thread for general scans or should i create one?