Date: Mon, 23 May 2011 06:56:30 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: "Andrey V. Elsukov" <ae@FreeBSD.org> Cc: Adrian Chadd <adrian@FreeBSD.org>, src-committers@FreeBSD.org, svn-src-all@FreeBSD.org, Marcel Moolenaar <marcel@xcllnt.net>, Stefan Farfeleder <stefanf@FreeBSD.org>, svn-src-head@FreeBSD.org, Warner Losh <imp@bsdimp.com> Subject: Re: svn commit: r221972 - head/sys/geom/part Message-ID: <11294.1306133790@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 23 May 2011 09:29:07 %2B0400." <4DD9F0A3.701@FreeBSD.org>
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In message <4DD9F0A3.701@FreeBSD.org>, "Andrey V. Elsukov" writes: >There is another opinion: >http://www.boot-us.com/gloss02.htm > >"There is the convention that partitions should always start and end on *= >cylinder boundaries*." It is actually more weird than that: The rule is that the starting or ending head of one of the four slices represent the number of heads used to access the drive, and ditto for sectors. This "requirement" dates back to "smart" BIOS'es and ST-506 drives which couldn't ask the drive for its geometry. It has been revived a couple of times, when people got creative around the various silly sizes, most notably the 524MB "limit". -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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