Date: Sun, 19 Dec 2010 15:41:21 +0100 From: Polytropon <freebsd@edvax.de> To: David Demelier <demelier.david@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Unable to extract audio cd tracks Message-ID: <20101219154121.99640f62.freebsd@edvax.de> In-Reply-To: <4D0E0B9E.5000505@gmail.com> References: <4D065DE0.2020509@gmail.com> <20101213232917.70fc36f6.freebsd@edvax.de> <4D0E0B9E.5000505@gmail.com>
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On Sun, 19 Dec 2010 14:41:50 +0100, David Demelier <demelier.david@gmail.com> wrote: > Thanks, > > The handbook says we must `taste' the media, it works but it prints a > warning > > markand@Melon ~ $ dd if=/dev/acd0 of=/dev/null count=1 > dd: /dev/acd0: Invalid argument > 0+0 records in > 0+0 records out > 0 bytes transferred in 0.000132 secs (0 bytes/sec) > > I just realized that using the block size for the same thing works : > > markand@Melon ~ $ dd if=/dev/acd0 of=/dev/null count=1 bs=2352 > 1+0 records in > 1+0 records out > 2352 bytes transferred in 2.893379 secs (813 bytes/sec) > > I propose modifying the following : > > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/creating-cds.html > > Make sure the appropriate files exist in /dev. If the entries are > missing, force the system to retaste the media: > > # dd if=/dev/acd0 of=/dev/null count=1 *bs=2352 > > Then people who try that won't be surprised by the Invalid argument error. A good idea - again one step into the right direction of providing high-quality documentation. In fact, I have never needed to "taste" the media in my extraction scripts, but I now do realize WHY: Before using dd bs=2352 to get the data, I did cdcontrol -f /dev/acd0 info which prints out the TOC of the audio CD and, I assume, makes sure the corresponding /dev/acd0tNN track files get created; cdcontrol is part of the base system so it should be possible to rely on its presence, at least on FreeBSD. -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...
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