I think that any of you have experienced the following situation at least once in your life. You download the DVD image of a Linux distribution package or some rare game (it's not that I'm not for piracy, but things happen) with some download manager like FlashGet or Wget and the image does not work - the checksum does not match.
Remember your feelings? Even if you have a good bandwidth, it will take a lot of time to download the ISO image again. But fortunately there is a way out. All you have to do is turn to torrent clients, for instance, BitTorrent or uTorrent.
While downloading any file, which is especially important for large files (for example, the iso images of DVDs),the torrent client automatically checks the checksums of files and if some part is downloaded incorrectly, it automatically downloads it again.
So it is enough for you just to take the torrent file of your image and load it to the torrent client specifying that you have an incompletely downloaded file. After that the torrent client will check your file, find the place where there was a failure and download the valid part.
Thus, you can get a working ISO image by downloading just a few kilobytes and without downloading all 4 GB again.
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