Sorry for resurrecting an old topic, but my LiteOn drive finally failed, as it started to read almost every DVD I had in the collection as a DVD-RW disc and being unreadable in Windows Explorer. I suspect it must have come from a bad batch as it was up to date with firmware. Prior to that failure I had to burn DVDs slightly differently, making an ISO image of the files I wanted to burn, then burn the ISO, and if the burnt disc became unreadable I cycled the tray a few times until it could be read then did a verification against the ISO image on my Hard disk, which passed all the time.
But anyway, ordered a Pioneer DVR-216DBK last week and started doing some burning on that now, fingers crossed as the issue hasn't come up yet