Hello, First time poster, I hope this is not a stupid question. I got a plextor px716a dual-layer burner, and some ridata dl discs. Two of the discs (so far) out of 15 have been ruined due to errors at the beginning of the burning process, or so it would seem. One such error said "power calibration area is full," then the disc ejects. I can put the disc back in and the program (Roxio Disc Copier) still recognizes it as a Blank DVD+R Dual Layer disc, but it just gives me an error again--sometimes a different error. Anybody know if this is the media, the software, or the hardware?