That is, until I read a lot about the instability of certain CDs. They apparently are not all created equal. I found out by trying to read some of the CDs I had burned previously, discovering that some of the files were unreadable. So much for archiving files. There is a bit of controversy about what is the cause of the problem - the media, the burner speed, how we label the CDs, etc.
Some people swear by certain brands of CDs.
They seem to have a long shelf life and can be written to and erased repeatedly and almost indefinitely without difficulty. The ones I use come in 640MB size although 1.3 gig disks are also available from Fujitsu. However, it may be a small price to pay for security. The disks are apparently indestructible. At this point, having never heard of M-O disks, I wrote Constance and asked her for specific information.