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Date:      Mon, 26 Jul 2010 10:19:01 +0200
From:      Stefan Esser <se@FreeBSD.org>
To:        freebsd-stable@freebsd.org
Subject:   Re: gpart -b 34 versus gpart -b 1024
Message-ID:  <4C4D44F5.6040603@FreeBSD.org>
In-Reply-To: <4c4cdfd7.Jb6syVdaC436gUYp%perryh@pluto.rain.com>
References:  <4C4BA50B.6050507@langille.org> <4C4BB672.3090109@langille.org>	<AANLkTinKEBb5S9REK3nn8GF3U=jRAtYMBBfsC5TB8Xj4@mail.gmail.com>	<AANLkTi=RGe7ygDYpF2u3BN4oPYSgyUUijOuLnz2q=XXY@mail.gmail.com>	<AANLkTimpeKJhqtihuOFwU%2BtQZeCVXy0-fbYUsoGgN%2BeF@mail.gmail.com>	<alpine.BSF.2.00.1007251349370.3572@woozle.rinet.ru> <4c4cdfd7.Jb6syVdaC436gUYp%perryh@pluto.rain.com>

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Am 26.07.2010 03:07, schrieb perryh@pluto.rain.com:
> Dmitry Morozovsky <marck@rinet.ru> wrote:
>> ... sector numbers (in CHS address method)
>> [start] at 1 (which always suprized me ;)
> 
> This goes back at least as far as soft-sectored 8" diskettes
> in the CP/M era.
> 
> IIRC, physical sector 0 of each track contained the C number,
> possibly the H, and a list of the remaining sectors on the track
> including the size of each sector -- even within a single track
> the sectors did not all have to be the same size.

This is extremely off-topic, and therefor, I´ll only say,
that the above is not true for 8" diskettes nor for CP/M.
I can only guess, that there is a track 0 and not a sector
with that number because the first track was reserved for
system internal use (e.g. held at least the CCP in case of
CP/M). I´m quite sure, that FDCs generally supported sector
numbers from 0 to 254 (with 255 reserved as a wildcard in
certain commands). But this is all really off-topic ...

Regards, STefan



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