Worse yet...I have CDs that are close to 10 years old that get all kinds of read errors when I try to get files off them. So much for CDs/DVDs being good archival media. I think I'd rather put files on a hard drive. One where you'd only write to it until it was full. No writing and deleting over and over. Write only when (not connected to a pc).
Are they CD-RW discs or just CD-R discs? I never did get into the CD-RW thing. I always just burned 'em and tossed in the file, even if it was nowhere near being a full discs worth of data. I have some that are like 8-10 years old that seem fine that are CD-R discs.
We've gone completely to hard drive backup. Either external USB or mobile racks for internal HDDs. I don't know what the life of the data is on them, but if it lasts 5 years, I'm good with it. We have SO much data there's really nothing else for us to use.