Article View: comp.sys.mac
Article #39605Re: Geometry of Apple SC80 (Quantum) disk
From: Charles Anderson
Date: Mon, 20 Mar 1989 18:38
Date: Mon, 20 Mar 1989 18:38
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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.
{sun, amdahl, ucbvax, pyramid, uunet}!unisoft!cander
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Path: arc1-ca.pugleaf.net!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