My old Mac IIsi floppy drive was full of dust and it could not read any floppies. I replaced it with another drive (cradle 805-5050-A, no markings in drive itself, it looks like SONY MP-F75W). For some reason it cannot read 1.44 MB disks and it formats blank disks to 880K capacity.
I know that 805-5050-A parts were used in some other Mac IIs, but I assumed that drives are interchangable.
Any tips how to proceed?
Do you have another drive you could try? It sounds like maybe the one you've tried is an 800k drive.
I carefully cleaned the dust from old drive and now it's up and running.