[plug] CD checking --"dd if=/dev/cdrom | md5sum" or "dd if=/dev/cdrom bs=1 count=23212032 | md5sum"?

[Daniel]

Hi Andrew and Plug, sorry I still can't get this cd checking right - I 
can't get the right md5sum (surely not all my cds are flawed) - I'm still 
doing something wrong.  Some direction on this would be greatly appreciated.

I have tried both:
dd if=/dev/cdrom | md5sum
and
dd if=/dev/cdrom bs=1 count=23212032 | md5sum
[where bs=byte size, and count is the number of bytes in the original iso]

Thank you,
Daniel.

At 10:59 21/08/2001 +1000, you wrote:
> > ...I thought I could just do -
> >
> > dd if=source of=output.iso
> >
> > and then do an md5sum on that, but it doesn't seem
> > to work on any of my cds
> > at all...
>
>Oh? Can you clarify "doesn't seem to work"? Works for
>me, this is how I usually verify CDs I burn (compare
>them to the ISO image I just created).
>
>I presume that by if=source you mean the CDROM device,
>eg if=/dev/hdc ?
>
>HTH
>Andrew


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