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

[Bill Kenworthy]

How do you burn them? (I havent been following the thread closely) - I
have found that some cd burning programs default to "padding" the burnt
image to a boundary (needed by some ancient cd players for audio).  This
then fails the md5sum.  One way to check is to rsync the dd'd image and
see if the only effect is at the end of the image, or perhaps use
hexdump or similar to examine the area in question.

BillK

On Thu, 2001-09-13 at 17:05, Daniel wrote:
> 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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