Comment 10 for bug 318249

When upstream ticket <http://trac.transmissionbt.com/ticket/2228> was filed yesterday with the summary "transmission should learn to truncate files on updating torrents" it reminded me of this ticket. IMO #2228's summary describes what's happening here.

What's happening is that when the updated iso is smaller than the earlier version, Transmission wasn't truncating the file, so the file checksum fails. However, the BitTorrent *piece* checksums are still correct, so you were *not* sharing bad data to the rest of the world.

At any rate, since upstream #2228 spelled out what was going on and how to fix it, this is fixed in upstream svn trunk in <http://trac.transmissionbt.com/changeset/8726> for 1.73.