The mirrors can be pretty flaky. Worse, mirror downloads are often corrupt (about 50% of the downloads that I did from mirrors were bad before the ISO started becoming available on BitTorrent, failing the md5 test). Rather than potentially waste a lot of time on a mirror download that might end up bad, I suggest using a BitTorrent client, if you have a router and firewall setting them up properly (see the downloading faq) and using BitTorrent to get a good copy. See the Knoppix BitTorrent Tracker link in the Get Knoppix section, link available near the top of this page. BitTorrent will get you a good copy, BitTorrent downloads can be restarted without problems, and I have found that when properly configured the BitTorrent downloads are much much faster than the downloads from the mirrors.