From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1RJVkM-00056T-K3 for garchives@archives.gentoo.org; Thu, 27 Oct 2011 19:36:14 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 2C03021C06F; Thu, 27 Oct 2011 19:36:05 +0000 (UTC) Received: from mail-ey0-f181.google.com (mail-ey0-f181.google.com [209.85.215.181]) by pigeon.gentoo.org (Postfix) with ESMTP id 9829321C02C for ; Thu, 27 Oct 2011 19:35:10 +0000 (UTC) Received: by eyx24 with SMTP id 24so3249473eyx.40 for ; Thu, 27 Oct 2011 12:35:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=FcAidf03/7hgdzsBWlCtox6uz7zEYJMLSmo86GlgBZA=; b=EKKWnbXuC8nQ/Cl/xxWuZjQvnDHZpk68LjPlNXgFNBhP3PbgEX8RV2GTmrZVm8XyUx HACjXhJhOdCpQuPrrQ5JwjxIpxXUq55Dgam3ATwzturfcRVDAddvSFNVMHAW6WomJGE4 klIDCCBw9Vc/CaJbmW7fO5vw4Sq0Gl54hXssk= Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Received: by 10.182.77.196 with SMTP id u4mr6741956obw.19.1319744109196; Thu, 27 Oct 2011 12:35:09 -0700 (PDT) Received: by 10.182.38.42 with HTTP; Thu, 27 Oct 2011 12:35:09 -0700 (PDT) In-Reply-To: <4EA9A5F7.9050904@gmail.com> References: <4EA9A5F7.9050904@gmail.com> Date: Thu, 27 Oct 2011 12:35:09 -0700 Message-ID: Subject: Re: [gentoo-user] the same hard-drives, different number of sectors... From: Mark Knecht To: gentoo-user@lists.gentoo.org Content-Type: text/plain; charset=UTF-8 X-Archives-Salt: X-Archives-Hash: 49b41b2588a090899436e2c271d36988 On Thu, Oct 27, 2011 at 11:41 AM, Jarry wrote: > Hi, perhaps someone could explain this to me: > > I have bouth two the same hard-drives. The same model > (Hitachi HUA722050CLA330), the same firmware (JP20A3EA), > the same size (500GB). Well, not exactly. Both hdparm > and fdisk report different number of sectors (976771055 > versus 976773168). Although not a big difference, yet > I expected them to be exactly the same (want to use > them for raid1). > > So how is it possible they do not have the same number > of sectors? I have bought them from one supplier, even > their serial numbers are very close (only the last 2 > characters out of 24 are different)... > > Jarry Maybe one has some stuff mapped out due to bad blocks found during manufacturing or something like that? Not sure what it will tell you but have you run smartctl on the drives and looked around at what they tell you to find any differences? - Mark