From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: ATA 4 KiB sector issues. Date: Wed, 17 Mar 2010 10:13:51 -0700 Message-ID: <4BA10DCF.3050901@zytor.com> References: <6af388e7-e313-4212-86c8-30ffa327411c@email.android.com> <4BA0F057.7020909@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from terminus.zytor.com ([198.137.202.10]:47656 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755255Ab0CQRPA (ORCPT ); Wed, 17 Mar 2010 13:15:00 -0400 In-Reply-To: <4BA0F057.7020909@redhat.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Ric Wheeler Cc: Tejun Heo , James Bottomley , Denys Vlasenko , Arnd Bergmann , "linux-ide@vger.kernel.org" , lkml , Daniel Taylor , Jeff Garzik , Mark Lord , tytso@mit.edu, hirofumi@mail.parknet.co.jp, Andrew Morton , Alan Cox , irtiger@gmail.com, Matthew Wilcox , aschnell@suse.de, knikanth@suse.de On 03/17/2010 08:08 AM, Ric Wheeler wrote: > On 03/16/2010 06:21 PM, H. Peter Anvin wrote: >> The only reason I see to care about CHS at all is that there are >> systems in the field which can only boot from USB in CHS mode, and >> which often look at the MBR partition table to guess the geometry. Of >> course, some then *report* the detected geometry but don't *use* the >> detected geometry... > > These systems, given the changes in modern microsoft releases, must be > doomed even without any effort on our part. > > I still think that we should work to make this ancient stuff disappear & > help force the legacy edge cases to modernize. It has been some huge > amount of time since storage vendors pretty much abandoned CHS (15 > years? 20?) :-) > I wish. This is mostly systems from the first half of the 2000's timeframe. There was a *huge* regression when BIOS vendors started doing USB boot; almost all of them introduced major bugs at that time; in many cases they still haven't been fixed. -hpa