Ok, it is definitely the DVD I am using. Was able to backup pictures on a hp +RW 4x dvd but not the memorex +R 8x dual layer dvd ...
It should work (most of the time) but then again it doesn't surprise me given the brand.
Verbatim, Tiayo Yuden, and Maxell must be doing something correctly or at least a bit more favorable since they have a 99% success rate. Memorex is significantly lower than 99% on most macs. May have to do with organic dye levels (not sure) or perhaps vendor shelf life. Maybe it's a combination of both as well as other factors that have to do with current practices in bulk media production. Simply stated, you get what you pay for.