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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