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From: chao@cory.Berkeley.EDU (Chia-Chi Chao)
Newsgroups: comp.sys.ibm.pc
Subject: Re: make your own HD 3 1/2 in floppies
Message-ID: <15483@pasteur.Berkeley.EDU>
Date: 15 Jul 89 21:43:48 GMT
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In article <8663@attctc.DALLAS.TX.US> wnp@attctc.Dallas.TX.US (Wolf Paul) writes:
>The question with regard to the 3.5" disk notchers is, what is responsible
>for the higher data density: just the design of the drives, or is the
>magnetic coating of the 1.4M disks different? All I have seen and heard
>on that subject so far are "guesses" -- nobody with facts.

There was an article here from Timothy Lange (35168 on 6/19/89) on all the
different diskettes.  Double density uses iron oxide, and high density uses
chromium oxide.  Magnetic coercivities are different.