UTorrent implemented support for "mutable torrents", the ability to replace a torrent with a new version and efficiently transition/duplicate all common content to the new torrent. In more modern times, a couple of years later, libtorrent and uTorrent got some support for pad files, for a different reason. ![]() Notably, uTorrent instead would stick these left-over pieces in a separate file, called a part file. Introducing pad-files ensures that files are aligned to pieces and make this problem go away. Otherwise when you de-select some files you may still get the first and last bit of it (because it overlaps pieces that you need for other files). Since bittorrent downloads pieces, and pieces may span multiple files. ![]() This feature was originally implemented by BitComet (with fairly poor quality of implementation in my opinion) as a way to make it simpler to de-select certain files from being downloaded.
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