26 Oct
2006
26 Oct
'06
10:46 a.m.
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:
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, tr?ume ich.
the second :
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.