I don't know how many mgs it is, but it's about 500 short songs. Early music and folk music mostly.I think that the idea of keeping it on floppies and simply renewing the floppies is the most workable. I don't have to make any special trips to do it.
Thanks for the insights. That was interesting about how the homemade CD's are inferior to commercial ones. Makes sense.
By the way, a friend who is in the computer business has suggested a second hard drive, and I have had a quote of $89 (US) for the parts. She would do the labor. Sounds extreme, though.