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On Friday, November 8, 2002, at 02:22 PM, Carl Parrish wrote:

> Okay I want to copy an ISO image. Can I do something like
> dd if=/dev/cdrom of=/target/dir/ iso9660
> Or would I be better off Coping the disk then using mkiso?

As Bill Jonas pointed out, this will not copy bootable CDs.  Using 
mkisofs will not result in "bit-perfect" copies, either(1).  Your 
method is the best one that I know of with the exception that you need 
to provide a file:

dd if=/dev/cdrom of=/target/dir/file.iso

If you are copying a Linux installation CD this is _highly_ recommended 
since it will retain the ability to boot and the MD5 hash (available 
from the publisher) will still match with the new CD.

(1) The individual files will be the same, but their position on the 
disk may be different.  This is usually not a problem, but it can be 
with certain copy restriction algorithms.  You also lose the CD's 
label/name with mkisofs unless you take extra steps to provide it.

- -- 
                                                            Voltage Spike
       ,,,
      (. .)
- --ooO-(_)-Ooo--

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