From owner-freebsd-questions@FreeBSD.ORG Mon Nov 16 06:41:12 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 2DFE81065694 for ; Mon, 16 Nov 2009 06:41:12 +0000 (UTC) (envelope-from m.seaman@infracaninophile.co.uk) Received: from smtp.infracaninophile.co.uk (gate6.infracaninophile.co.uk [IPv6:2001:8b0:151:1::1]) by mx1.freebsd.org (Postfix) with ESMTP id BA9478FC08 for ; Mon, 16 Nov 2009 06:41:11 +0000 (UTC) Received: from happy-idiot-talk.infracaninophile.co.uk (localhost [IPv6:::1]) (authenticated bits=0) by smtp.infracaninophile.co.uk (8.14.3/8.14.3) with ESMTP id nAG6dxVO025997; Mon, 16 Nov 2009 06:40:04 GMT (envelope-from m.seaman@infracaninophile.co.uk) X-DKIM: Sendmail DKIM Filter v2.8.3 smtp.infracaninophile.co.uk nAG6dxVO025997 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=infracaninophile.co.uk; s=200708; t=1258353606; bh=+28vNtPim+SlxFJUYWJxWq0VR6Kss2Ajv/ndL9UuTfQ=; h=Message-ID:Date:From:MIME-Version:To:CC:Subject:References: In-Reply-To:Content-Type:Cc:Content-Type:Date:From:In-Reply-To: Message-ID:Mime-Version:References:To; z=Message-ID:=20<4B00F3B9.5050500@infracaninophile.co.uk>|Date:=20M on,=2016=20Nov=202009=2006:39:53=20+0000|From:=20Matthew=20Seaman= 20|Organization:=20Infracaninophi le|User-Agent:=20Thunderbird=202.0.0.23=20(X11/20090823)|MIME-Vers ion:=201.0|To:=20freebsd-questions@freebsd.org|CC:=20"Ronald=20F.= 20Guilmette"=20|Subject:=20Re:=20Bad=20Bloc ks...=20Should=20I=20RMA?|References:=20<42307.1258330015@tristate logic.com>=20<44my2n45zd.fsf@be-well.ilk.org>|In-Reply-To:=20<44my 2n45zd.fsf@be-well.ilk.org>|X-Enigmail-Version:=200.95.6|Content-T ype:=20multipart/signed=3B=20micalg=3Dpgp-sha256=3B=0D=0A=20protoc ol=3D"application/pgp-signature"=3B=0D=0A=20boundary=3D"---------- --enig1C3AA9122AA101440FF12FCC"; b=J2dCh0RKlnlvtokNqsAo6n9fYXpfnLd4Ne4vhvMGus+vYDzU5AeBQWXgvhd+jMwAc NcDhijEHF3BTXsRbYHPpYQtsQ7GQPSvlkm3X1YU5tl0x/+VjuWa8vpxiQOH3gYzq8W Jo0DEgrSvP41T4gsAehTP8vFxpcj1CLhl1LDM7Jc= X-Authentication-Warning: happy-idiot-talk.infracaninophile.co.uk: Host localhost [IPv6:::1] claimed to be happy-idiot-talk.infracaninophile.co.uk Message-ID: <4B00F3B9.5050500@infracaninophile.co.uk> Date: Mon, 16 Nov 2009 06:39:53 +0000 From: Matthew Seaman Organization: Infracaninophile User-Agent: Thunderbird 2.0.0.23 (X11/20090823) MIME-Version: 1.0 To: freebsd-questions@freebsd.org References: <42307.1258330015@tristatelogic.com> <44my2n45zd.fsf@be-well.ilk.org> In-Reply-To: <44my2n45zd.fsf@be-well.ilk.org> X-Enigmail-Version: 0.95.6 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------enig1C3AA9122AA101440FF12FCC" X-Virus-Scanned: clamav-milter 0.95.3 at happy-idiot-talk.infracaninophile.co.uk X-Virus-Status: Clean X-Spam-Status: No, score=-2.9 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VERIFIED,NO_RELAYS autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on happy-idiot-talk.infracaninophile.co.uk Cc: "Ronald F. Guilmette" Subject: Re: Bad Blocks... Should I RMA? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2009 06:41:12 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig1C3AA9122AA101440FF12FCC Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Lowell Gilbert wrote: > "Ronald F. Guilmette" writes: >=20 >> Nov 15 15:24:17 coredump kernel: ad4: FAILURE - READ_DMA status=3D51 error=3D40 LBA=3D256230591 >=20 > This is *not* necessarily a big deal, despite what your other response > told you. Errors on reads do not mean that your drive's bad-sector > table is full; only errors on write indicate that. If you can try > manufacturer's drive diagnostics, do that. If you can't, then it's > harder to fix things up, but not impossible; write back if you > really can't use a low-level diag. Yes -- this is correct. It's possible for a disk to be unable to read a = sector, but rewriting the sector would either succeed and leave the sector fully = working again, or cause it to be remapped in which case the disk will subsequentl= y perform=20 perfectly well[*]. Beyond running the manufacturers diagnostics, as the OP has said he has = nothing particularly valuable on the drive, it might be worth running a f= ew passes of dban or similar on the disk --- this will overwrite every part of the platter = and should make it abundantly clear if there is a real and persistent problem= =2E If you can't afford to scrub the disk, then just keep it under observation: = if the problems recur within a few weeks then yes, definitely RMA that drive. Cheers, Matthew =20 [*] If the error messages have disappeared since, then this has probably already happened. --=20 Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW --------------enig1C3AA9122AA101440FF12FCC Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.13 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEAREIAAYFAksA874ACgkQ8Mjk52CukIxukQCaA1i9VJB5FZf3ETbcPUv+V9jo Hg8An25YY0zm+wnuTpt+6bWGjjsrMpC4 =gAus -----END PGP SIGNATURE----- --------------enig1C3AA9122AA101440FF12FCC--