Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!news.cs.indiana.edu!bronze!silver!ntaib
From: ntaib@silver.ucs.indiana.edu (Nur Iskandar Taib)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Diffs between DD & HD disks
Message-ID: <1991Apr16.144826.15159@bronze.ucs.indiana.edu>
Date: 16 Apr 91 14:48:26 GMT
References: <1991Apr11.033648.5311@ism.isc.com> <1991Apr15.021812.2745@bilver.uucp> <1991Apr16.022449.19593@ism.isc.com>
Sender: news@bronze.ucs.indiana.edu (USENET News System)
Organization: Indiana University, Bloomington
Lines: 25

>"As Table 1 indicates, HD floppies differ from DD ones not only in physical
>appearance but in the coating thickness and magnetic properties of their
>media.  These differences mean that a 2MB recording head can't completely
>saturate the magnetic coating on a 1MB disk.  A DD floppy should never
>be subtituted for a HD one.  A DD diskette can not be reliably recorded
>by a HD drive, even with the proper use of the reduced write current
>required by the greater magnetic sensitivity of the DD formulation."

I think the way to think about this is that 
the HD drives can accept packets of data that
are physically smaller, so it needs a medium
that will more readily accept data that is 
closely packed. Think in terms of the difference
between silk and canvas.





--
-------------------------------------------------------------------------------
Iskandar Taib                        | The only thing worse than Peach ala
Internet: NTAIB@AQUA.UCS.INDIANA.EDU |    Frog is Frog ala Peach
Bitnet:   NTAIB@IUBACS               !
-------------------------------------------------------------------------------