From owner-freebsd-scsi Sun Jul 1 8: 3:40 2001 Delivered-To: freebsd-scsi@freebsd.org Received: from mailhub.fokus.gmd.de (mailhub.fokus.gmd.de [193.174.154.14]) by hub.freebsd.org (Postfix) with ESMTP id 855B537B406 for ; Sun, 1 Jul 2001 08:03:33 -0700 (PDT) (envelope-from schilling@fokus.gmd.de) Received: from fokus.gmd.de (sherwood [193.175.133.102]) by mailhub.fokus.gmd.de (8.8.8/8.8.8) with ESMTP id RAA06395; Sun, 1 Jul 2001 17:03:21 +0200 (MET DST) Received: (from jes@localhost) by fokus.gmd.de (8.8.8+Sun/8.8.8) id RAA16964; Sun, 1 Jul 2001 17:02:54 +0200 (MET DST) Date: Sun, 1 Jul 2001 17:02:54 +0200 (MET DST) From: Joerg Schilling Message-Id: <200107011502.RAA16964@fokus.gmd.de> To: mckay@thehub.com.au, schilling@fokus.gmd.de Cc: freebsd-scsi@freebsd.org, ken@kdm.org Subject: Re: Problems reading burned CDs Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org >From mckay@thehub.com.au Sun Jul 1 16:50:52 2001 >On Sunday, 1st July 2001, Joerg Schilling wrote: >>>From ken@panzer.kdm.org Sun Jul 1 06:01:32 2001 >> >>>On Thu, Jun 28, 2001 at 22:25:18 +1000, Stephen McKay wrote: >>>> Actually, the difference is pressed vs burned CDs. >>It is really a bad idea to use dd to read a CD. >I think it's important that the raw CD be presented in a fully readable >format. Then dd (and everything else) will work properly. Please don't try to do this! It is a known fact that these problems with TAO CD's exist. If you change FreeBSD, then it would behave different from an other OS. As I already said: you should not read a CD with dd but with 'readcd'. readcd allows you to specify sectors=from-to to exclude these run-out sectors. Future versions may even do this automatically. >>>> Is there any way around these problems with SCSI CD drives? >> >>Read README.verify & README.copy for a long answer.... >I'm still digesting this information (from the cdrecord program, if anyone >else is looking for them). I am assuming that 2 (or more) unreadable >sectors are added, not that I lose 2 sectors of data. Right? correct. >>>Just out of curiosity, what did you use to burn the CD? cdrecord? >We might either have to lie about the capacity (so that every reported byte >can be read), or deal specially with the run out blocks (by faking them >as nulls). Again: please don't do that! You would only create confusion. All people who know CD standards known about this Authors of CD drivers and ISO-9660 filesystem should know it. >>># cdrecord dev=1,4,0 -toc >>>Cdrecord 1.9 (i386-unknown-freebsd4.2) Copyright (C) 1995-2000 Jörg Schilling >> >>A really old one..... >Old software lives on! I'm still using 1.8, by the way. >It also looks like you renamed your suite to: cdrtools. I expect the >cdrecord port maintainer didn't notice. I don't know who this is and I expect that a port maintaner is on the right mailing lists where this change has been discussed at least for 2 years. Jörg EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin js@cs.tu-berlin.de (uni) If you don't have iso-8859-1 schilling@fokus.gmd.de (work) chars I am J"org Schilling URL: http://www.fokus.gmd.de/usr/schilling ftp://ftp.fokus.gmd.de/pub/unix To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message