I finally have a computer with a CD-RW and was overwhelmed when I went to purchase discs. There were CD Recordable for Music and for Computer Data, CD RW double density and single density, and shelves of different brands. If it is all digital, what is the difference between music and computer quality? Does the manufacturer of the CD make any difference other than price? I was also told by someone in the store that if a CD-Recordable is full it begins writing over existing data rather than informing you the disc is full. Any truth to this?