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SubjectRe: Disk geometry from /sys
Hello Seewer,

On Wed, Apr 16, 2008 at 9:49 AM, Seewer Philippe <> wrote:
> Correct. Though be really careful which geometry you are requesting:
> root@local:/# sfdisk -g /dev/sda
> /dev/sda: 7296 cylinders, 255 heads, 63 sectors/track
> root@local:/# sfdisk -G /dev/sda
> /dev/sda: 116280 cylinders, 16 heads, 63 sectors/track
> The first one is the kernels idea of a disks geometry which is probably as
> often correct as it's just plain wrong,

Sorry but I don't understand, what do you mean ?

> versus the second one which tries to
> guess a disks geometry by looking at the current partition table. Which
> might be just as wrong since its only necessary for bios and/or bootloader.

But what happens if you want to guess the geometry of a disk with no
partition table ? You need to trust the kernel guess but from what I understood
it's just wrong.


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