Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!atha!aunro!alberta!herald.usask.ca!regina!hercules!cazabon
From: cazabon@hercules (Charles Cazabon (186-003-526))
Newsgroups: comp.sys.amiga.advocacy
Subject: Re: Give The Amiga Some Credit Already!
Message-ID: <623@regina.uregina.ca>
Date: 22 Jun 91 02:56:14 GMT
References: <1991Jun18.121129.28202@news.iastate.edu> <1991Jun19.043057.24705@cunixf.cc.columbia.edu> <1991Jun19.170209.397@news.iastate.edu> <1991Jun19.225700.16473@mintaka.lcs.mit.edu>
Sender: news@regina.uregina.ca
Reply-To: cazabon@hercules.uregina.ca (Charles Cazabon (186-003-526))
Organization: University of Regina, Regina, Saskatchewan
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In article <1991Jun19.225700.16473@mintaka.lcs.mit.edu> rjc@wookumz.gnu.ai.mit.edu (Ray Cromwell) writes:
:In article <1991Jun19.170209.397@news.iastate.edu> taab5@isuvax.iastate.edu writes:
:>
:>   As far as I know, the AE and Commodore drives are totally incompatible (at
:>least they are incompatible in the high-density mode).  The two companies
:>used totally different schemes to get the drives to work on Amigas.  The
:>Commodore drives format to the full 1.76MB capacity, while the AE drives
:>only format to 1.52MB in high-density.
:
:  That's probably not it Marc. Commodore says their drives are
:880k and (2*880k=1.76mb) but when formatted they are less. AE's
:drive is probably 1.76mb too, but when formatted by the OFS they are
:probably less. Even if they aren't compat, C='s drive will
:eventually prevail and AE will have to fix their trackdisk.device
:to read and write Commodore's disks.
:
Uhh, sorry, thanks for playing.  The AE high density drive supports two modes:
880K and 1.52 meg.  That's the equivalent of 11 and 19 sectors per track.  It
can't read the 18 sectors per track of the 1.44 meg standard.

Commodore's drive ABSOLUTELY HAD TO read the 1.44 meg standard to be able
to qualify for System V, Release 4 Unix.  CBM's drive supports 880K mode,
1.44 meg mode, and 1.76 meg mode.  These are equivalent to 11 sectors per
track, 18 sectors per track, and 22 sectors per track.  Oh yes, and of course
720K (9 sector per track) mode, which the AE drive also handles.  These are
FORMATTED capacities.  Unformatted, any high density drive is called a 2 meg
drive.


--Chuck Cazabon, cazabon@hercules.uregina.ca
* My Opinions Are Not My Own...Feel Free To Plagiarize