The 400 & 800 KB diskettes require special hardware, which rotated at variable speeds to get more data on a single diskette. This is why Mac diskette drives were so much more expensive.

I'm sure that quite a few of us on this list have Macs that can read your diskettes. Where are you located?

As an alternative, I dimly recall hearing or reading about some software tool to read the data off the 400/800 KB disks using a standard drive. You might try searching a bit for something like that.

On Mar 20, 2005, at 5:20 PM, Herbert Goodfriend wrote:

A PC-using friend of mine asked me to use my Mac to open a program that is on a floppy disk from 1994. My floppy drive (actually an Imation SuperDisk drive) does not recognize it; the floppy does not mount and I don't even get the dialogue box saying that the disk is unreadable and offering to initialize it. The drive does recognize 720KB PC-formatted disks and 1.44MB disks.

I would guess that the unrecognizeable floppy must be an older Mac 400 or 800KB format. Does this sound correct?

I checked Apple Knowledge Base and it tells me that 400KB floppies were not supported in OS 8. I can't find anything about 800KB floppies.

It seems that I will have to find someone with a Mac running OS 7.x and a floppy drive, no? Any advice appreciated.


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