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From: davidsen@steinmetz.steinmetz.UUCP (William E. Davidsen Jr)
Newsgroups: comp.sys.ibm.pc
Subject: Re: new floppy format proposal
Message-ID: <7779@steinmetz.steinmetz.UUCP>
Date: Thu, 5-Nov-87 14:17:57 EST
Article-I.D.: steinmet.7779
Posted: Thu Nov  5 14:17:57 1987
Date-Received: Sun, 8-Nov-87 03:47:37 EST
References: <4289@cit-vax.Caltech.Edu> <1155@cup.portal.com> <7735@steinmetz.steinmetz.UUCP> <4386@cit-vax.Caltech.Edu>
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Organization: General Electric CRD, Schenectady, NY
Lines: 36
Keywords: high-density floppy

In article <4386@cit-vax.Caltech.Edu> tim@cit-vax.UUCP (Timothy L. Kay) writes:
|In article davidsen@crdos1.UUCP (bill davidsen) writes:
|>|How about defining a new floppy format where the outside of the disk is
|>| [ many things ]
|>High density diskettes have different coatings. The material used has a
|>higher hysterysis (it is harder to magnetize and demagnetize). I doubt
|>that a diskette which used one oxide on the inner tracks and one on the
|>outer would be dirt cheap. Victor got the only free lunch there was,
|>they pushed the outer tracks as hard as the inner.
|
|Bill, I think you've missed the point.
|
|Your comment about different coatings on the outside and inside of
|the disks doesn't make any sense.  Consider an existing high-density
[ I didn't use ;-) on that one because I assumed that everyone would
  understand that I was kidding. Obviously you didn't ]
|floppy.  The medium has to have the higher hysterysis so that it can
|provide a higher *linear density* on the inner tracks.  However, because
|the outer tracks are moving more quickly, their linear density is
|much higher than necessary. 

[ this is exactly what Victor did, they put more data on the outer
tracks than the inner by slowing the disk rotational speed and thereby
putting the bit (flux changes) closer together, as they would be on the
inner tracks.  I'm glad you agree with me, but I wish you wouldn't
phrase it as though you were correcting what I said.

You can't use high density writes to a regular disk.  You need a high
density disk for high density writes because the coating is different. 
You *can* slow the speed so that the flux changes are closer together at
normal density.  ]

-- 
	bill davidsen		(wedu@ge-crd.arpa)
  {uunet | philabs | seismo}!steinmetz!crdos1!davidsen
"Stupidity, like virtue, is its own reward" -me