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From: ugfailau@sunybcs.uucp (Fai Lau)
Newsgroups: comp.sys.ibm.pc
Subject: Re: new floppy format proposal
Message-ID: <6343@sunybcs.UUCP>
Date: Fri, 6-Nov-87 03:08:55 EST
Article-I.D.: sunybcs.6343
Posted: Fri Nov  6 03:08:55 1987
Date-Received: Sun, 8-Nov-87 11:33:10 EST
References: <4289@cit-vax.Caltech.Edu> <1155@cup.portal.com>
Sender: nobody@sunybcs.UUCP
Reply-To: ugfailau@joey.UUCP (Fai Lau)
Organization: SUNY/Buffalo Computer Science
Lines: 35
Keywords: high-density floppy

In article <7779@steinmetz.steinmetz.UUCP> davidsen@crdos1.UUCP (bill davidsen) writes:
>
>[ 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.
>
	Does anyone know what the exact format of the 3.5 diskettes
is? When you slow the disk down, you'd have more cluster per
track. It seems that there are still disk space wasted because
you cannot put an additional cluster (or sector, depending
on what the formatting method is) on the next track out until
the track is "out" enough and the speed is slowed down enough
to allow enough space for it. What you'd get is a "staircase"
effect. Am I right?

>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.  ]
>
	The difference in the coating is the size of the magnetic
particles and their density. Otherwise the coatings are pretty
much the same for normal disk and high-dens disk. They might
also change the coating for the particles (not the disk coating
which *contains* the particle) for the difference in
roatation speed, if there is any. And off cause, you can
always write a high density disk with a normal drive..


Fai  Lau
SUNY at Buffalo (The Arctic Wonderland)
UUCP: ..{mit-ems|watmath|rocksanne}!sunybcs!ugfailau
BI: ugfailau@sunybcs