[clug] Unique Id's and CD's
Andrew Janke
a.janke at gmail.com
Thu May 7 03:23:55 GMT 2009
2009/5/7 Brett Worth <brett at worth.id.au>:
> Jack Kelly wrote:
>
>> /dev/cdrom | sha1sum ?
>
> Of course that assumes that /dev/cdrom is executable. Which it probably isn't. Maybe you
> meant:
>
> sha1sum < /dev/cdrom
>
> Or:
> cat /dev/cdrom | sha1sum
>
> The down side of these methods is that to determine the unique ID of the cdrom requires a
> full read which takes a while. It'd be nicer if the unique id was perhaps written into
> the cd label at burn time. Depends on whether the requirement is for new cds or for all cds.
Thanks all for the pointers, I have decided to go with:
du -ak /media/cdrom0/ | sort -k 2 | sha1sum
So that I am combining file names and sizes. Should be sufficient. The
sort is in there as I am not all that sure that du will always return
the same thing for a disk that has been burnt with all the same files
but in a different order. (duplicate CD's are a real possibility).
--
Andrew Janke
(a.janke at gmail.com || http://a.janke.googlepages.com/)
Canberra->Australia +61 (402) 700 883
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