[Linux] "Fixing" failed download

[Danny Rathjens]

Kwan Lowe wrote:
> Anyone know of a way to "fix" a failed DVD ISO download?  I have an ISO image of
> Centos 5_x64. It fails the md5sum. Because my link is so slow, even a torrent
> download will take about 4 days at my current rate.
> 
> So, given a corrupted ISO, is there a way to delete the bad parts and re-download
> only the good?

Yes. Start the torrent download. Stop it.  Move the .iso you have to where
the new 0 size .iso file was just created by the new torrent.  You want
to overwrite it with the same name.  Now start the torrent again and it
will check the existing file and only download the specific chunks that
fail checksum, not the whole thing.