From owner-freebsd-questions@FreeBSD.ORG Mon Oct 8 11:21:23 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 5CB581065673 for ; Mon, 8 Oct 2012 11:21:23 +0000 (UTC) (envelope-from freebsd-listen@fabiankeil.de) Received: from smtprelay05.ispgateway.de (smtprelay05.ispgateway.de [80.67.31.93]) by mx1.freebsd.org (Postfix) with ESMTP id 1802B8FC22 for ; Mon, 8 Oct 2012 11:21:22 +0000 (UTC) Received: from [84.44.210.110] (helo=fabiankeil.de) by smtprelay05.ispgateway.de with esmtpsa (SSLv3:AES128-SHA:128) (Exim 4.68) (envelope-from ) id 1TLBOM-0007tM-ED; Mon, 08 Oct 2012 13:20:58 +0200 Date: Mon, 8 Oct 2012 11:33:41 +0200 From: Fabian Keil To: Warren Block Message-ID: <20121008113341.2f040b54@fabiankeil.de> In-Reply-To: References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/i4SZMA9rAa5ufgZh7Veefzc"; protocol="application/pgp-signature" X-Df-Sender: Nzc1MDY3 Cc: freebsd-questions@freebsd.org Subject: Re: DVD OPC errors with growisofs 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: Mon, 08 Oct 2012 11:21:23 -0000 --Sig_/i4SZMA9rAa5ufgZh7Veefzc Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Warren Block wrote: > I'm using growisofs to write DVDs of backup files. Some combinations of= =20 > older drives and newer media give ":-( unable to PERFORM OPC:=20 > Input/output error". If you are concerned about this, you could try cdrecord to see if it makes a difference. =20 > Can limiting write speed avoid these errors? That depends on both the drive and the media. It's also possible that it makes matters worse, though. It's a myth that reducing speed guarantees better results. > And what ways are there to= =20 > detect the fastest speed supported by both drive and media? The drive is supposed to figure it out on its own. If your drive supports it, you can use readcd to measure how well burned media can be read and do a couple of experiments with various burn speeds to see if it affects the results for your drives and the media you care about. Fabian --Sig_/i4SZMA9rAa5ufgZh7Veefzc Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAlBynfoACgkQBYqIVf93VJ0v3gCgxeybXGwqUVZBeveNOmIPkg8y vxwAoKFEo7cbkp/ZQ3YFd9MKXOkU1dnQ =s17w -----END PGP SIGNATURE----- --Sig_/i4SZMA9rAa5ufgZh7Veefzc--