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@jmacz thank you so much for the linked thread! It turns out that I have EXACTLY the same issue: a metal probe on UH7 pin 4 and all of a sudden formatting works perfectly. I admire your perseverance and thanks for the very thorough investigation and write-up. I need to determine what would be...

Very interesting thread! Thank you. I'll take a look at uh7 later tonight or tomorrow.

It won't write or format diskettes, but reads them flawlessly.

I'm having an issue with a recapped SE/30. Post recap and ultrasonic cleaning, the logic board works flawlessly, except for the floppy drive. The drive works fine as a boot drive and can also read floppy disks without any issues; however formatting ANY disk fails (400K, 800K, 1.4M) . When...