I wanted to post here, so as to not start a new topic about the same thing.
I am having the same problem as the original poster.
The Exact error I get is:
Disc not writeable. Insert writeable disc.
(Medium in drive: DVD+R. Medium required by compilation: DVD+R/RW, DVD-R/RW.)
I've been using the same brand of DVD+R for about a year now (Imation) which I get from Walmart.
The Drive itself will burn to DVD+RW as well to CDs of any type but it will not burn to a regular DVD+R or DVD-R.
The Drive is a TOSHIBA ODD-DVD SD-R5272 that I've had for three years now.
I have the last error log and can post it on request.
Any help would be much appreciated.