Date: Tue, 08 Jul 2003 16:43:07 -0400 From: Chuck Swiger <cswiger@mac.com> To: Ion-Mihai Tetcu <itetcu2@xnet.ro> Cc: questions@freebsd.org Subject: Re: dd an audio cd on 5.x ? Message-ID: <3F0B2CDB.8090800@mac.com> In-Reply-To: <200307082309.37378.itetcu2@xnet.ro> References: <200307081546.52889.itetcu2@xnet.ro> <44k7as23qg.fsf@be-well.ilk.org> <200307082309.37378.itetcu2@xnet.ro>
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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. 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.... -- -Chuck
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