Floppies use the FAT12 file system and that is independent of the OS file system and also whether or not the o/s is 32 or 64 bit. It doesn't sound like a driver issue as Windows reports back that the disk needs to be formatted. The most likely issue is that the heads of the external drive don't line up with the floppy tracks thus making it unreadable, and lefty gets the "need to format" message.
Another possibility is that the external drive will only read 720K or 1.44MB disks, one or the other. So if it will only read 1.44 and the Sartin disks are 720K that's a problem. You would think backward compatibility but maybe not.
Or it could just be that the data is gone. Floppy disks were not the most reliable medium.
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