Path: utzoo!attcan!uunet!unisoft!cander
From: cander@unisoft.UUCP (Charles Anderson)
Newsgroups: comp.sys.mac
Subject: Re: Geometry of Apple SC80 (Quantum) disk
Message-ID: <1979@unisoft.UUCP>
Date: 20 Mar 89 18:38:22 GMT
References: <7772@polya.Stanford.EDU>
Lines: 16

From article <7772@polya.Stanford.EDU>, by kaufman@polya.Stanford.EDU (Marc T. Kaufman):
> In article <3083@stpstn.UUCP> aad@stepstone.com (Anthony A. Datri) writes:
>>I need the geometry for the 80 meg Quantum disk in an Apple 80SC drive.
>>Any help appreciated.
> There are $262D2 = 156370 sectors on the HD80.  This is 19 x 10 x 823.
> I would make a first guess that this represents 823 cylinders, 10 heads, and
> 19 sectors per track. (other factorizations may be possible).

Close, but not quite. There are 823 cylinders, 32 sectors per track, 6
heads, two alternate sectors per cylinder.  Thus, there are 190 usable
sectors per cylinder.

-- 

Charles.
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