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From: tim@j.cc.purdue.edu (Timothy Lange)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Are 720K floppies really 1.44M in disguise?
Message-ID: <8892@j.cc.purdue.edu>
Date: 6 Feb 89 15:39:23 GMT
References: <1140@ccncsu.ColoState.EDU> <3284@ima.ima.isc.com> <3720@uoregon.uoregon.edu>
Reply-To: tim@j.cc.purdue.edu (Timothy Lange)
Distribution: usa
Organization: PC Learning Resource Center, Purdue University
Lines: 11

Important!  Data loss can occur!  High density disks have a different
chemical makeup than double density disks.  High density disks use a
Chromium oxide, double density uses an Iron oxide coating.  Other than
that the 3.5" disks are the same (the high also has more sectors per
track).  As for the 5.25" disks there are more differences.
Formatting double density disks at high density is risky business,
data loss will occur over time due to a mismatch in the recording
frequency and the media composition.
-- 
Timothy Lange / Purdue University Computing Center / Mathematical Sciences Bldg
West Lafayette, IN  47907 / 317-494-1787 / tim@j.cc.purdue.edu / CIS 75410,525