I never heard of a 3.25" floppy, but there was a
3" version. It
was used by Amstrad (possibly others too ? )
There were (at least!) two different -
and incompatible, of course - 3.25"
drives produced.
Neither got taken-up by anybody significant.
The 3" drive was used in the Tatung Einstein as well as various Amstrads and
possibly a few
less well known systems.
Andy
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