From mboxrd@z Thu Jan 1 00:00:00 1970 From: One Thousand Gnomes Subject: Re: 64 bit kernel won't mount / Date: Mon, 26 Jan 2015 21:38:30 +0000 Message-ID: <20150126213830.3f9f38f5@lxorguk.ukuu.org.uk> References: <201501191145.41492.gheskett@wdtv.com> <20150121172326.040dd702@lxorguk.ukuu.org.uk> <201501211421.35532.gheskett@wdtv.com> <20150122153458.6493d3fd@lxorguk.ukuu.org.uk> <54C55DA3.4050400@ubuntu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from 251.110.2.81.in-addr.arpa ([81.2.110.251]:60280 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753100AbbAZWGW (ORCPT ); Mon, 26 Jan 2015 17:06:22 -0500 In-Reply-To: <54C55DA3.4050400@ubuntu.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Phillip Susi Cc: Gene Heskett , linux-ide@vger.kernel.org On Sun, 25 Jan 2015 16:18:27 -0500 Phillip Susi wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA512 > > On 01/22/2015 10:34 AM, One Thousand Gnomes wrote: > > Unlikely. Apart from fdisk the setup is basically invisible. The > > drive reports a block size and an offset. The firmware offset is > > chosen so that the chassic DOS alignments in fdisk happen to just > > fall nicely on 4K boundaries for partition starts. > > > > There is nothing special the OS does to deal with ATA/SATA 4K > > sectors. > > Incorrect: the kernel bogus/synthetic "geometry" is the maximum > allowed of 63 sectors per track, and the old dos default alignment for > the first partition on the disk places its start at sector 63, which > is not 4k aligned. The special thing that partitioning tools I guess if you count partitioning tools as the "OS" this is true, but by the OS I meant "system call layer and below". Alan