What file format are floppy disks8/29/2023 ![]() ![]() Problems arise when using a DSHD floppy in a DD drive: it is possible to format a DSHD floppy using a DD format, but if the floppy was ever formatted with an HD format (or was pre-formatted, as was common in the late 90s), a DD drive won’t be able to correctly reformat it (because its write signal isn’t strong enough). HD drives can adjust their field strength to write appropriately, so an HD drive can write to a DD floppy without creating issues. DSDD and DSHD floppies use different metals, with different coercivities. The main concern with non-LS 3.5” floppies is the metal used in the medium. ![]() SuperDisk drives can be ignored as far as backwards-compatibility is concerned: they have two head assemblies, one for “standard” formats, the other for LS formats, and the “standard” head is equivalent to a high-density 3.5” drive’s. I’ll limit my answer to common 3.5” formats on PCs, DSDD, DSHD, and SuperDisk, as listed in your question. ![]()
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