On 14 Nov 2007 at 7:50, Scott Quinn wrote: I think that sounds mostly like a matter of lousy media. I just finished a job where I had about 100 Kaypro 10 diskettes recorded in 1988 on 3M 5.25" DSHD media. When I first saw them, I said "uh-oh, this is going to be bad". It wasn't. Only one diskette had an error on it--and the file was duplicated elsewhere. I was never a fan of the 400K/800K Mac recording style. Other than being a vanity platform, it afforded no storage capacity advantage over standard MFM IBM System 34-encoded disks, required a special drive and was absolutely incompatible with anything else on the market. I also tend to believe, based on my own experience, that it's nowhere near as reliable as single-speed System 34 recording. I can see where the simple GCR used on the original Apple II platform had its place in shaving a few bucks off the cost of a machine, but it should have never been carried to the Mac--which had to be *more* expensive, given the costs of custom LSI and a multispeed drive. Obviously, Apple agrees with me. It's not terribly unusual for an old Mac owner with 15-20 year old diskettes to find that only about half of them are readable. That would be exceptionally bad in the case of just about any other platform. I'm not trying to start a "Mac vs. (anything else)" fight, just stating an opinion based on my own experience over the years. Cheers, Chuck