linux-kernel - Re: Disk geometry from /sys

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Message-ID: <480EDCF5.5000306@bfh.ch>
Date:	Wed, 23 Apr 2008 08:53:41 +0200
From:	Seewer Philippe <philippe.seewer@....ch>
To:	Mark Lord <lkml@....ca>
CC:	Francis Moreau <francis.moro@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Disk geometry from /sys

Mark Lord wrote:
[snip]
> The earliest IDE drives for Compaq used only CHS sector addressing mode.
> 
> Within four years, though, all new drives had support for the more 
> sensible linear block addressing (LBA) mode, as well.
> 
> LBA has been mandatory in new drives since the early 1990s,
> so there's really no point to CHS addressing any more,
> except when fiddling with MS-DOS style partition tables
> (which have both CHS and LBA values stored inside).

Sorry, can't resist that quip here... Many of the well known x86-based 
OS', OS-installers and even bootloaders from this millenium trusted the 
partition tables c/h/s values to match the bios... causing havoc say 
with PATA drives atached to SATA connectors.

If that weren't the case I guess Linux could have get rid of c/h/s a 
looong time ago. Hmmm... maybe its time?
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