...almost *any* MFM (or RLL, they're the same hardware, just the data encoding method differs) hard drive with four or more heads and of suitable physical size would work as a replacement for a bum Hyperdrive.

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Although my MMI drive still works, I would prefer to replace it with a flash drive, since any replacement spinning platter drive that was made back in the early 1980's would have the same potential for failure, not to mention high current consumption, slow speed, noise, etc. However, I am not aware of any MFM or RLL drive replacement flash solution. Are you?