From owner-freebsd-questions@FreeBSD.ORG Wed Aug 26 17:01:23 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 05C5C1065672 for ; Wed, 26 Aug 2009 17:01:23 +0000 (UTC) (envelope-from gesbbb@yahoo.com) Received: from smtp104.prem.mail.ac4.yahoo.com (smtp104.prem.mail.ac4.yahoo.com [76.13.13.43]) by mx1.freebsd.org (Postfix) with SMTP id 88EC88FC14 for ; Wed, 26 Aug 2009 17:01:22 +0000 (UTC) Received: (qmail 80863 invoked from network); 26 Aug 2009 17:01:21 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Received:Date:From:To:Subject:Message-ID:In-Reply-To:References:Reply-To:Organization:X-Mailer:Face:Mime-Version:Content-Type:Content-Transfer-Encoding; b=fqyEA9etSk5522yBh37hjpELN+EF5QBE8YfIHa7ilOR6VhFfXot1mb78JtXYxNF40GCMLpJLljDnqMe623DaiG8z8doh2lBx4Hxtc7pZN+3xPC3CYhnS7Ec+hc/FIv+hKonIQjLA4WjScrJwYmB2aT5NuVGz0Vc6rc9t6T7c+vo= ; Received: from c-67-189-183-172.hsd1.ny.comcast.net (gesbbb@67.189.183.172 with login) by smtp104.prem.mail.ac4.yahoo.com with SMTP; 26 Aug 2009 10:01:21 -0700 PDT X-Yahoo-SMTP: yeAAMgKswBATCul4lSbCWspvTA-- X-YMail-OSG: UMfLXk8VM1llWboeJIcIcPOMIaZZG93ZIVe0myzxaHk0c4Zj635HIM0w9RoH7JqBUDqNAX8J.OMDZqPwOhWFbhznPhRgyxCQOMMhPIunJymCq.mzhn1MfnWhCEbDNY3YWORKH_Vadvb0oalF31mIIC8EM3sTLnJEJtmXonNKzeWwRHLJX64e2IeSzVsepbTXnhKK9Y.JJMUfZEWdQGRps5P1q2omeZ0xBngyOoZqDKBrrmCy64S9wSpr.7LIAZUEG3mB78s56x7g8MbqTP6sSyITisLg023ck0hFligmlDh6lC1OfI3AzQkUDDXwUDaUn.SXVbQQ36_raSOLtS2bTzWwufCr.vV7Dvz2P5w- X-Yahoo-Newman-Property: ymail-3 Received: from scorpio.seibercom.net (localhost [127.0.0.1]) (Authenticated sender: gesbbb@scorpio.seibercom.net) by scorpio.seibercom.net (Postfix) with ESMTPA id AE16A2282F for ; Wed, 26 Aug 2009 13:01:20 -0400 (EDT) Date: Wed, 26 Aug 2009 13:01:20 -0400 From: Jerry To: freebsd-questions@freebsd.org Message-ID: <20090826130120.5d30aa8d@scorpio.seibercom.net> In-Reply-To: <20090826161038.GE11739@phenom.cordula.ws> References: <1338880b0908241129p75b6845cg26d21804e118364@mail.gmail.com> <20090824224003.0b5ac2df.freebsd@edvax.de> <20090826161038.GE11739@phenom.cordula.ws> Organization: seibercom.net X-Mailer: Claws Mail 3.7.2 (GTK+ 2.16.5; i386-portbld-freebsd7.2) Face: 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 X-Face: "\j?x](l|]4p?-1Bf@!wN<&p=$.}^k-HgL}cJKbQZ3r#Ar]\%U(#6}'?<3s7%(%(gxJxxcR Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: hard disk failure - now what? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: freebsd-questions@freebsd.org List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Aug 2009 17:01:23 -0000 On Wed, 26 Aug 2009 18:10:38 +0200 cpghost wrote: > On Mon, Aug 24, 2009 at 02:51:41PM -0600, Tim Judd wrote: > > >> Buy spinrite, no matter what. > > > > It's OS/FS independent. it works on the bits stored on the magnetic > > platters, NOT on a filesystem. TiVo, Linux, BSD and Mac OSX drives > > are treated the same. Bits on a magnetic platter. It's recovery > > stems from the randomization and movement of the head to the sector > > in question that allows it to salvage any bits it can (for example, > > other recovery will abandon 512bytes if 1 bit cannot be read. > > spinrite will recover 512bytes-1bit to a hard drive's spare sector > > once spinrite says "i'm done working with this sector".) It leads > > to a very successful rate. > > (Disclaimer: I'm not familiar with spinrite.) > > 512bytes-1bit may be read back, but you can't be sure that those are > the correct bytes! IIRC, sectors are usually protected by some kind of > ECC. Simply ignoring the ECC and reading raw magnetic data will all > too often result in corrupt sectors. > > Of course, if you have out-of-band error correction or at least error > detection mechanisms (like .PAR or md5/sha1 checksums), raw magnetic > recovery is better than nothing, if you're desperate. > > -cpghost. I have used Spinrite several times with excellent results. In fact, I recently used it to recover a Laptop drive that had become unusable. Spinrite tries to turn off ECC if possible. It is not the cheapest product; however, it works better than anything else I have tried on bonked discs. Use it on its highest recover level and it will recover the drive; although it may take a while. http://www.grc.com/intro.htm -- Jerry gesbbb@yahoo.com Lord, defend me from my friends; I can account for my enemies. Charles D'Hericault