Hi, for your info i am also suffering the same problem, i have a sony optiarc DVD RW AD-7200S running on an ASUS P5ND mobo. It is a fairly new system with the latest drivers, i have used various discs including RITEC and the only ones that seem to work ok are DVD+RW. (but not DVD-RW)
The strange thing is (as you can see from the ImgBurn Log) is that if i keep hitting the retry button, after "retrying 119" the disc burn't fine and finished. It also plays perfectly.
I originaly thought it was a problem with dvd decrypter and the new Optiarc, but, obviously not !
I 15:58:08 ImgBurn Version 2.4.2.0 started!
I 15:58:08 Microsoft Windows XP Home Edition (5.1, Build 2600 : Service Pack 3)
I 15:58:08 Total Physical Memory: 2,095,596 KB - Available: 957,472 KB
I 15:58:08 Initialising SPTI...
I 15:58:08 Searching for SCSI / ATAPI devices...
I 15:58:08 Found 4 DVD-ROMs and 1 DVD