CD-ROM archiving

[Jan-Benedict Glaw]

On Thu, 2006-10-26 13:36:33 -0400, Roger Merchberger <zmerch-cctalk at 30below.com> wrote:
> Rumor has it that Adam Goldman may have mentioned these words:
> > I usually use dd, or even cat, on the first try reading a disc, just
> > out of laziness. But there's a program 'readcd' (part of the cdrtools
> > suite, IIRC) which is a little more sophisticated. In particular, if
> > a disc has a marginal sector or two, dd will give up, but readcd will
> > retry until it gets a good read.
> 
> dd will "give up on that sector but continue beyond error" if one uses:
> 
> dd conv=noerror ...
> 
> It can be handy if one needs to get data after a bad spot on the disk.

Prerequisite:

  * It's a pure data CD
  * The error wasn't willfully placed

`readcd' is a even better than `dd'/`cat', because it can access the
CD drive at a lower layer, thus preserving more data. (That is, you
can eg. image VideoCDs with it, or CD-DAs and the like. These cannot
be cloned using dd.)

MfG, JBG

-- 
      Jan-Benedict Glaw      jbglaw at lug-owl.de              +49-172-7608481
  Signature of:                           Wenn ich wach bin, träume ich.
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