When rarring videos, it is common practise that the rars do not use compression (store-mode), which of course means that it is possible to skip to the end (to read the avi index), and i've been told that it's not possible with unrar.dll
and in case you're wondering
the rars exist just to split the video into smaller files, so that they can be transfered over non-error-correctable systems, and avoid corrupting the whole thing, if a transfer error corrupts one rar, just retransfer that one
PS.
torrents do hash error corrections, so this doesn't really have anything to do with torrents
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