Date: Wed, 9 Jul 2003 01:01:52 +0300 From: Ion-Mihai Tetcu <itetcu2@xnet.ro> To: Chuck Swiger <cswiger@mac.com> Cc: questions@freebsd.org Subject: Re: dd an audio cd on 5.x ? Message-ID: <200307090101.52233.itetcu2@xnet.ro> In-Reply-To: <3F0B2CDB.8090800@mac.com> References: <200307081546.52889.itetcu2@xnet.ro> <200307082309.37378.itetcu2@xnet.ro> <3F0B2CDB.8090800@mac.com>
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On Tuesday 08 July 2003 23:43, Chuck Swiger wrote: > Ion-Mihai Tetcu wrote: > > On Tuesday 08 July 2003 22:55, Lowell Gilbert wrote: > > [ ... ] > > >> That command will copy a data disk, but you have separate > >> tracks on this thing. > > > > Ok. And if I want to copy bit by bit ? > > You'd have to obtain the glass master used to press the original to > get an absolutely exact copy. "bit-by-bit" accuracy of the raw CD is > not very easy or even desirable to obtain due to ECC hardware fixing > minor errors: for audio, you want a "bit-by-bit" accurate copy of the > data after ECC processing, not before. OK, do you know any method to do it under BSD ? There are some cdtools in the ports that claim to do DAE - but I haven't the time to look in thecode to see how it is done and if there is any difference between using a SCSI an an IDE drive. > Better CD-burners let you do something known as DAO+96 ot TAO+96, > which lets you override the ECC hardware when reading or writing, and > thus copy even the errors from the original, which can be useful for > copy-protected data CD's rather than for audio.... We have a potential client who asked about studying both cases and make him a app that could say if it's an "original" or not so this sounds interesting (we're pretty new on this). Thanks, IOnut
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