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Date: Mon, 19 May 2003 21:11:04 -0700
From: Joshua Oreman <oremanj@webserver.get-linux.org>
To: Eduardo Viruena Silva <mrspock@esfm.ipn.mx>
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cc: questions@freebsd.org
Subject: Re: Creating a bin or ISO image of a CD??
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On Mon, May 19, 2003 at 10:39:45PM -0500 or thereabouts, Eduardo Viruena Silva seemed to write:
> On Mon, 19 May 2003, Joshua Oreman wrote:
> 
> > On Mon, May 19, 2003 at 07:28:45PM -0600 or thereabouts, Warren Block seemed to write:
> > > On Mon, 19 May 2003, Eduardo Viruena Silva wrote:
> > >
> > > > try:
> > > >
> > > > 	dd if=/dev/acd0c of=my_image bs=2352
> > >
> > > Hmmm.  This brings up something I've wondered about.  I always use
> > > bs=2k to match the actual sector size of CDs.
> > >
> > > But does it matter?  Is there any reason not to use a larger buffer size
> > > to speed up reading CDs?
> >
> > As long as you use a multiple of the same size, you should be fine. However,
> > the block size you pick should also be a multiple of the size of the track
> > you're ripping. It'll still work otherwise, but `dd' will complain.
> >
> > HTH,
> > -- Josh
> >
> 
> Josh, I believe the size of the track should be a multiple of the
> block size.

But when you multiply the block size to speed things up, it might
not be exact.

-- Josh

> 
> I also had the problem of reading tracks, asked
> freebsd-questions and I got that as the answer, I mean, they
> told me that audio cd use blocks of 2352 bytes length.