Date: Wed, 14 May 2003 12:48:02 -0500 (CDT) From: Eduardo Viruena Silva <mrspock@esfm.ipn.mx> To: Malcolm Kay <Malcolm.Kay@internode.on.net> Cc: freebsd-questions@freebsd.org Subject: Re: burncd -- possible problem Message-ID: <20030514124647.L6141@Gina.esfm.ipn.mx> In-Reply-To: <200305142239.15266.Malcolm.Kay@internode.on.net> References: <200305142239.15266.Malcolm.Kay@internode.on.net>
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On Wed, 14 May 2003, Malcolm Kay wrote: > I'm not sure whether I have a problem burning CD-Rs -- certainly > I don't understand what I observe. > > The OS is FreeBSD 4.7-release. > > I take a commercial CD-ROM and copy it as an image with: > # cp /dev/acd1c natins.cd > which creates the file natins.cd of around 673400*1024 bytes > without any apparent problem. (I can't remember the exact size > but was certainly a multiple of 1024). > > # md5 natins.cd > and > # cat /dev/acd1c | md5 > produce identical results. > > Now inserting a blank CD-R: > # burncd -f /dev/acd1c data natins.cd fixate > runs apparently normally and without error. > > But now > # cat /dev/acd1c | md5 > produces and IO error and a different checksum > > # cp /dev/acd1c natins.back > produces the same IO error and a file 8*1024 bytes > shorter than natins.cd. > > If I strip off the last 8k from natins.cd and compare the > result with natins.back I find they are the same. > > When I look at the last 8*1024 bytes stripped from natins.cd I > find these are all zero (ie NUL). > > Re-running burncd on a new CD-R blank repeats the result > exactly; i.e. IO error 8k short of the size of the original but the > rest matching. > > As a mounted cd9660 file system the copy appears normal and > the visible files test identical to those on the original. > have you tried dd ? dd if=/dev/acd0c of=natins.cd bs=2048 > Questions: > Is what I'm observing normal when writing with burncd? > Do I have a hardware problem? > Is this due to some bug in burncd? > > Should I worry about this or just ignore? > > Malcolm Kay > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > - ______ _ * / /###\ / \ __ /\ /\ * / ./#### \ * \__|_/ | | / \/ \ | b#####| * _ | __ | | __ = .. \____ \ \_\#####/ / \| / \ | | /\_\/ = \_| * \___\###/ * \_/\_/\__/\__\/_/\__/ = \______/ _ | |
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