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If one inserts an ED disk into a floppy drive, which supports sizes only up to HD, how does it cope with ED?

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It doesn’t, at least not in any particularly useful way. Because of the position of the density sensor cut-out on ED floppy disks, they’re detected as 720K floppies by HD drives. Their contents can’t be read, but they can be reformatted as DD disks...

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    And then? What happens then? Do they work as DD? – neverMind9 Jan 19 '18 at 20:15
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    Yes, with the limitations of DD disks written by HD drives (they don’t work reliably in DD drives). – Stephen Kitt Jan 19 '18 at 20:28

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