On Sun, 2005-01-16 at 11:54 -0500, Alan Cox wrote:
> On Sun, Jan 16, 2005 at 11:51:13AM -0500, Fulko Hew wrote:
> > >Thats correct behaviour. The end of a CD is very low accuracy only.
> >
> > OK. But (in my nievity) doesn't that make it difficult to 'dup' CDs?
> > ie. you couldn't do a: dd if=/dev/cdrom of=test.iso bs=2048
>
> Each copy will gradually get a bit longer unless you know the real .iso size
> (which is easy to find).
FWIW, we ship the program "isosize" to do this. So use -pad with
cdrecord while burning, and then you can do this to make an iso from it:
dd if=/dev/cdrom of=test.iso bs=4096 \
count=$(($(isosize /dev/cdrom)/ 4096+1))
And that shouldn't have the growth problem Alan has mentioned. Note
that the "+1" is only really needed if the image doesn't end on a block
boundary.
--
Peter