[wellylug] Creating data CD's accurately.

[Richard Hector]

On Thu, Aug 07, 2003 at 01:16:14AM +1200, Nigel Walters wrote:
> Hi,
> 
> I download iso images and then check the MD5 checksum. So far so good.
> Then I burn the image to CD using the following command
> 
> cdrecord -v dev-0,0,0 image.iso
> 
> I attempt to verify that the image is correct by reading the image back.
> 
> dd if=/dev/scd0 of=newimage.iso
> 
> I always get an error on the readback but newimage.iso seems
> functionally ok.
> 
> Unfortunately when I perform the md5sum on the final image it is
> incorrect.

I've heard that dd sometimes doesn't do everything right when reading a CD.

In particular, I think it reads past the end, or something like that - so
the image might work OK, but the md5sum doesn't match.

I think the preferred way to read cds is with readcd - comes with cdrecord
AFAIK, so you should have it (I do - not that I've used it yet).

Let us know how it goes.

Richard