From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from list by lists.gnu.org with archive (Exim 4.71) id 1UGKXP-0000AS-Dm for mharc-grub-devel@gnu.org; Thu, 14 Mar 2013 22:38:31 -0400 Received: from eggs.gnu.org ([208.118.235.92]:50848) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UGKXM-00009O-8L for grub-devel@gnu.org; Thu, 14 Mar 2013 22:38:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UGKXA-000438-Oi for grub-devel@gnu.org; Thu, 14 Mar 2013 22:38:28 -0400 Received: from mail-lb0-f169.google.com ([209.85.217.169]:37442) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UGKXA-000434-Gv for grub-devel@gnu.org; Thu, 14 Mar 2013 22:38:16 -0400 Received: by mail-lb0-f169.google.com with SMTP id m4so2443462lbo.0 for ; Thu, 14 Mar 2013 19:38:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:date:from:to:subject:message-id:in-reply-to:references :x-mailer:mime-version:content-type:content-transfer-encoding; bh=T+pmjbkHhmkb1S+Y4xH41saQqCfQoBjOw0P009mqvN4=; b=pFek5iQQNUyoD5DsOOT44onC6vE/SgLZgSnBydFDcRWCPXy1sBqXExqexfSsWT7od8 KuFCvkSCdZ9v/R0zvRBYhKjEfTh30LTrqgwTHOAtJofPwatA0OYX/xWV5mCduWj7fwuu VPOuQ/35WTwLJWHj2RmQ2R77BlzwySPU86+hdllF+NDSXHgoNvhi96wHaj5KgdL2Dq4C IWSjl43+N2alOfyw6hs7cPB9my3LIQUPlIrrSOaGIRuc+PN+JiU0dh2hNP52Yg8WpoLZ IB7d97wQz2Q7VivLAcq2zwAMxFRZJjGrIeb3mndBK1uDzx9xW5zUvPJpOPVN25l+z0vI ELzQ== X-Received: by 10.152.113.164 with SMTP id iz4mr4184969lab.50.1363315094567; Thu, 14 Mar 2013 19:38:14 -0700 (PDT) Received: from opensuse.site (ppp79-139-243-180.pppoe.spdop.ru. [79.139.243.180]) by mx.google.com with ESMTPS id z1sm1466826lbk.2.2013.03.14.19.38.13 (version=SSLv3 cipher=RC4-SHA bits=128/128); Thu, 14 Mar 2013 19:38:13 -0700 (PDT) Date: Fri, 15 Mar 2013 06:38:12 +0400 From: Andrey Borzenkov To: grub-devel@gnu.org Subject: Re: USB3 3TB HDD boot Message-ID: <20130315063812.4b84a40f@opensuse.site> In-Reply-To: <4C3F5BBE-86BD-488F-A5FE-9D834B428189@colorremedies.com> References: <1360696755.21718.53.camel@pracovna> <20130304191935.GF20462@csclub.uwaterloo.ca> <5134F71F.1040300@gmail.com> <20130304194307.GJ20462@csclub.uwaterloo.ca> <51359D36.1040105@gmail.com> <4C3F5BBE-86BD-488F-A5FE-9D834B428189@colorremedies.com> X-Mailer: Claws Mail 3.9.0 (GTK+ 2.24.10; x86_64-suse-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 209.85.217.169 X-BeenThere: grub-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list Reply-To: The development of GNU GRUB List-Id: The development of GNU GRUB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 Mar 2013 02:38:29 -0000 =D0=92 Thu, 14 Mar 2013 20:18:46 -0600 Chris Murphy =D0=BF=D0=B8=D1=88=D0=B5=D1=82: >=20 > On Mar 5, 2013, at 12:22 AM, Vladimir '=CF=86-coder/phcoder' Serbinenko <= phcoder@gmail.com> wrote: >=20 > > On 05.03.2013 00:16, Chris Murphy wrote: > >=20 > >>=20 > >> On Mar 4, 2013, at 12:43 PM, "Lennart Sorensen" wrote: > >>=20 > >>> On Mon, Mar 04, 2013 at 08:33:51PM +0100, Vladimir '=CF=86-coder/phco= der' Serbinenko wrote: > >>>> Not necessarily. 3T drives often use msdos, just with 4K sectors whi= ch > >>>> increases the range of msdos to 16T. > >>>=20 > >>> Hmm, I suppose that would work. I have never seen one that did that = yet, > >>> but I don't have that many 3TB drives either. > >>=20 > >> I wonder what the BIOS does when it "asks" the drive for LBA 0, and re= ceives 4096 bytes instead of 512 bytes. > >=20 > > It doesn't get that far. Most likely it bails out after reading SCSI > > descriptor. >=20 > I have anecdotal evidence these drives are now in the wild. Mac user with= a new 3TB Seagate USB 3 external drive: > Device / Media Name: Seagate Backup+ Desk Media >=20 > This is not very descriptive. But when I ask the user to display the GPT = with gdisk, there's normal output, except for this line: > Logical sector size: 4096 bytes >=20 > Next, when I have him report the result from: > sudo dd if=3D/dev/disk3 count=3D2 2>/dev/null | hexdump -C >=20 > The 1st 512 bytes reported is the PMBR, but the 2nd 512 bytes is garbage,= not the GPT header as expected. >=20 It is possible that you need to read in physical sector size; what if you try bs=3D4k? > When this drive is connected to the computer and he tries to boot Windows= , the system hangs at a black screen. That's kinda interesting/concerning, = if even CSM-BIOS implementations on recent EFI firmware can have problems w= ith such drives. >=20 >=20 > Chris Murphy > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > https://lists.gnu.org/mailman/listinfo/grub-devel