Date: Wed, 3 Aug 2005 14:51:06 +0200 From: cpghost <cpghost@cordula.ws> To: Greg 'groggy' Lehey <grog@FreeBSD.org> Cc: Jeff Mitchell <skeezix@skeleton.org>, freebsd-questions@freebsd.org Subject: Re: DVD burning.. Message-ID: <20050803125106.GA4047@epia2.farid-hajji.net> In-Reply-To: <20050802005219.GY75379@wantadilla.lemis.com> References: <20050801170353.P10855@fw.skeleton.org> <20050802005219.GY75379@wantadilla.lemis.com>
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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. Oh, and this happens with multiple DVD writers on different machines. Regards, -cpghost. -- Cordula's Web. http://www.cordula.ws/
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