You must be using Windows XP. I was backing up to CD until I had to
reinstall XP. After that it won't even try to access the CD.
Others here have had no problem. Others have. There is a message here
with a link to Microsoft's Knowledge Base about this problem. From what
I understand it is the way XP writes to CD.
That doesn't explain how it worked for me before, but I now have to
backup to another folder and then move that over to CD.
If you aren't using XP I don't have a clue. Hopefully someone else here