[CentOS] Torrent: reminder to use it folks!

On Dec 17, 2007, at 10:05 PM, Robert Arkiletian wrote:
>
> Also don't forget that many mirrors offer rsync. If you rename your
> 5.0 DVD to the 5.1 version and do an rsync it will save lots of
> bandwidth.


I could be tired, but could you please elaborate how this is possible?  
A dvd iso with X number of files of all different bytes diff'd against  
another dvd iso with X number of entirely different bytes.