On Fri, 9 Feb 2007, Geoff Reed wrote:
From memory
here... isn't the ONLY 'physical' difference between the 400K
and 800K
mac formats that the 400K is single-sided, double density (the
density formerly called quads density on 5 1/4" media) and 80K is Double
sided Double Density? (and yes, I am pretty sure I remember that the 400 and
800K aren't a standard MFM format... weren't they GCR or something equally
bizarre?
Yes, the 300K Mac format is single sided, and the 800K is double sided.
They are both GCR, NEITHER is normally called "double density".
The 1.4M Mac format IS MFM/"double density" although the marketing people
call it "high density"