Date: Fri, 5 Aug 2005 14:09:49 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: cpghost <cpghost@cordula.ws> Cc: Jeff Mitchell <skeezix@skeleton.org>, freebsd-questions@freebsd.org Subject: Re: DVD burning.. Message-ID: <20050805043949.GR75379@wantadilla.lemis.com> In-Reply-To: <20050803125106.GA4047@epia2.farid-hajji.net> References: <20050801170353.P10855@fw.skeleton.org> <20050802005219.GY75379@wantadilla.lemis.com> <20050803125106.GA4047@epia2.farid-hajji.net>
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--W2IRJ2e1E3eviBXu Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wednesday, 3 August 2005 at 14:51:06 +0200, cpghost wrote: > On Tue, Aug 02, 2005 at 10:22:19AM +0930, Greg 'groggy' Lehey wrote: >> of coasters, and it might help identify the issues. All my burn >> failures (about 40% of total!) have been with DVD+Rs, though >> admittedly a cheap no-name brand bought in Taipei. I've found that >> they work OK if I burn them at speed=1; if I use the default speed of >> 4, they usually fail. > > Same here. DVD+R fail for me at a similar rate, though DVD-R from > the same brand are doing just fine. > > What's puzzling is that growisofs doesn't always notice errors > while burning. Approx 1/3rd of errors are first detected while reading > the DVD+R back in (MEDIUM ERROR READ BIG etc..). OTOH, I'm adding and > later checking md5 checksums for every file; and I've never had a > checksum mismatch. If something goes wrong, it's the whole reading of > a sector or a bunch of sectors. I don't think that's puzzling. Writing doesn't imply reading; if the drive thinks it has written the data, you can't find out whether the medium has also stored it until you read it back. You'll note that the script I mentioned (http://www.lemis.com/grog/making-AUUGN.html) includes a separate verify step. Based on my experience (and yours :-), I'd strongly recommend always verifying. New discovery about ISO file systems (today): you can burn symlinks to DVD, and they'll work under FreeBSD and Linux. They fail under Microsoft. Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address and phone numbers. --W2IRJ2e1E3eviBXu Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD4DBQFC8u2VIubykFB6QiMRAhHWAJjFt8F6kkPK4NssxWJjT9j+r7ydAJ0dgp9R QymDT0FB/hH7tTFtSHq94A== =T1P7 -----END PGP SIGNATURE----- --W2IRJ2e1E3eviBXu--
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