linux-kernel - Re: Disk geometry from /sys

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Message-Id: <E1JjiaS-0005QV-00@calista.eckenfels.net>
Date:	Thu, 10 Apr 2008 00:16:12 +0200
From:	Bernd Eckenfels <ecki@...a.inka.de>
To:	linux-kernel@...r.kernel.org
Subject: Re: Disk geometry from /sys

In article <20080409212840.GB2160@...lub.uwaterloo.ca> you wrote:
> Simplest way to find out what geometry a disk pretents to have is to ask
> fdisk, and since the only use for the information is when creating
> partitions, then fdisk's opinion is really all that seems to matter.

Unfortunatelly there is also bios' view of the geometry, which is especially
a problem for boot loaders. Just another hint:

# lilo -T geom

    bios=0x00, cylinders=80, heads=2, sectors=18
        (  1.44Mb         2,880 sectors)        C:H:S supported (PC bios)

BIOS reports 2 hard drives
    bios=0x80, cylinders=527, heads=255, sectors=63     vol-ID: 2C731DD1
        (  4.33Gb     8,467,199 sectors)        LBA32 supported (EDD bios)
    bios=0x81, cylinders=527, heads=255, sectors=63
        (  4.33Gb     8,467,199 sectors)        LBA32 supported (EDD bios)

(um yes my system is somewhat outdated, thats an adaptec scsi bios.

Gruss
Bernd
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