sábado, 7 de janeiro de 2012

Fixing bad downloaded .iso with bittorrent

If you've been long enough on the web, you probably know the bittorrent (peer-to-peer) protocol is nowadays the best way to share and download big files over the Internet.

But did you also know it could also be used to fix corrupt files you've downloaded? 

Say, for instance, you've downloaded the latest ubuntu.iso directly from your browser.  You had problems trying to use, so you've checked its MD5 and it didn't matched, so you know your file is corrupt, but you would like to avoid re-downloading 700Mb again.

Bittorrent allows you to fix the corrupt .iso file and as a matter of fact, any other kind of file --  of course, provided it has a public or know .torrent/tracker -- by downloading only the missing portion of it from the seeders. 

All you have to do is download the correspondant .torrent file, open with your preferred bittorrent client (Transmission, uTorrent, Vuze, etc.) and, when asked the location for saving the file, indicate the folder containing the corrupt .iso file you want to fix.
(Most bittorrent clients will do this automatically, but it might be necessary to ask for a manual verification of the "local data" to assure the application recognizes the file you want to fix.)

Bittorrent will adjust as needed the file originally downloaded, getting from seeders all the missing parts and, as the case may be, by deleting extra/corrupt bits of the file, so that your file becomes exactly the same as the original, good one.

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