I think CDRWs are too slow (4x), but I do use them to transfer small data (<600MB) to other PCs - then there's the reformat factor. I also had problems with multisessions, but latetly, it has worked sometimes. It's really hard to burn a 10MB file on a 700MB CD and not use multisession. It might also be a good idea to limit your runtime folders to 600MB+ (to allow for custom files... p5 supports multi runtimes) and back them up to seperate CDs... such as V1 stuff, v2 stuff, v3 stuff, ect.