Date: Thu, 10 May 2001 20:44:06 +0200 From: "Julian Stacey" <jhs@jhs.muc.de> To: Jens Schweikhardt <Jens.Schweikhardt@marconi.com> Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: read trouble with Yamaha CRW6416 Message-ID: <200105101844.f4AIi6d59201@jhs.muc.de> In-Reply-To: Your message of "Thu, 10 May 2001 13:32:47 %2B0200." <20010510133247.D13838@bk4957.de.marconicomms.com>
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Jens Schweikhardt wrote: > Note that there are no I/O errors, it's just garbage that's > in the files. Nasty. > A 10X Pioneer CD Reader in the same system reads all those CDs > without a hitch, so it's definitely the Yamaha that's icky. The > CDs look perfect, no scratches or anything, so read errors due > to that should not be the real problem. The Yamaha reads its > self-burnt CDs just fine. So my question is: what can I do/test/ > configure/update/tune to make my Yamaha read other CDs correctly? > Any insights deeply appreciated. Thanks! Dont assume WC Inc CDs that look unscratched are perfect: On more than one set of WC Inc CDs over the years I've seen errors, & they weren't scratched AFAIR., though there were sometimes optical effects more like waves, (as if they'd been washed). I make an on-line index of all my off line CDs, inc. md5 of every file on CDs, thus I read aprox the whole surface, so I suppose I see more errors than others ( script at http://bim.bsn.com/~jhs/bin/.sh/new_cd ) . I normally see IO errors on my console though ( xterm -C ) . BTW WC are very good about replacing bad CDs. I've got a lot of drives (mostly very old), Different cd drives can read different media, it's do with optical sensitivity, differentiating, some writeable half see through greenish CDs a friend wrote were particularly problematic. Rewriteables are apparently harder to read than than writables, which in turn are harder to read (need more differential sensitivity) than plain old manufacturer supplied cdroms. Julian - Julian Stacey Unix Consultant - Munich Germany http://bim.bsn.com/~jhs/ Ihr Rauchen => mein allergischer Kopfschmerz ! Kau/Schnupftabak probieren ! Like Linux ? Then also look at FreeBSD with its 5000+ packages ! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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