Re: howto verify burn?

[bob parker <bob_parker@dodo.com.au>]

On Thu, 6 Mar 2003 06:03, Craig Dickson wrote:
> bob parker wrote:
> > On Thu, 6 Mar 2003 04:22, Ray wrote:
> > > how do i verify that the burned cd is correctly burned?
> > >
> > > i burned a set of Debian 3.0r1 cds and have md5sums of the isos, but
> > > they don't match the output of
> > > md5sum -b /dev/cdrom
> >
> > Not really an expert on what happens on cds but I belive it has something
> > to do with the some extra nulls packing it out to the end of a 2048 block
> > or something like that.
> >
> > In any case the actual cd generally has a different md5sum than the iso.
> >
> > One way:
> > cat /dev/cdrom > test.iso
> > md5sum test.iso
> > md5sum original.iso
>
> Isn't
>
>    md5sum /dev/cdrom
>
> equivalent to
>
>    cat /dev/cdrom >test.iso
>    md5sum test.iso
If it is you will get the same md5sum from both, did you try it?

I've been using the file by file method in backup scripts without any 
problems except when I get the odd coaster. So that may be the way to go.

Bob