The spec doesn't support it. Any USB 5.25" drive is going to either need special drivers or would have to pretend to be a generic mass storage device, which giv

The spec doesn't support it. Any USB 5.25" drive is going to either need special drivers or would have to pretend to be a generic mass storage device, which gives you a differently weird set of compatibility issues. Should be possible to make it read/write, but formatting would be a nightmare and it wouldn't appear as a floppy drive at the OS level, just a weird small memory card reader or something.