I bought a SONY DRU-530A about 6 weeks ago, it worked great.
a week ago it stopped buring -R/RW media. I have been using Ritek and Taiyo Yuden without a problem, but now they are making fine coasters.
It does still seem to burn +RW media (haven't tried +R) it's just the -R/RW it's having problems with.
It does have the latest firmware upgrade (03).
Any ideas what I can try?