Hi Eric, I take it from your note take your CD500 worked fine taking the 200+ photos? To really help I need more info, new sounds if any, time it take the error to show, type of cd used (cdr, cdrw), any other new actions the camera is taking. Some items to check. (1) Is the "eye" clean (2) check the cd hub the black thing the cd locks onto; for some reson the work loss, if you can move it at all without moving the larger ring then you found the couse. (3)do some testing with other cd's (4) some coumpters running windows 98 will read unfinalized cd's I will help you more should you need it, let me know if any thing worked Al