Re: apple 2 question

[david@uow.edu.au (David Wilson)]

Liam Busey <liam1@ix.netcom.com> writes:

>Pim Blokland wrote:
>> I heard that HD floppies DO use the same media as DD.
>> So we heard differently... but before this degenerates into a flame

Sorry to inject facts into this discussion :-) but here are Sony's
specifications for HD & DD 3.5" disks (I am only listing the ones that differ):

					MFD-2HD		MFD-2DD

Max Rec Density (ftpr)			15,916		7,958
		(bpi)			17,434		8,717
Recording capacity			1.44MB		720KB
					80x18x2x512	80x9x2x512
Coating thickness (um)			0.9		1.9
Residual magnetic flux density (mT)	75		70
			       (gauss)	750		700
Coercive force (KA/m)			57		52
	       (Oe)			720		650

Taken from http://wsony.sosin.com.sg/cgi-bin/mfdsmalltable/model,m=10mfd-2ddbu

So they are different. I tried to get the 5.25" specs but the server reports
errors. I suspect that the difference between a 5.25" DD and HD is much larger
than that between a 3.5" DD and HD.
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia  david@uow.edu.au