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Why does uTorrent do this?


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I'm downloading a very large torrent, except right now I want to finish ONE single file of the torrent, I have 98.8% of it, with about 3 - 5 MB left. And yet when I tell ALL the other files to not download, the remaining column at the top registers at far more than 50 MB. Why?

Also most of the time, when I select one file or a group of files to download my speed suddenly drops to like 10 KB/s from the usual 200 - 350 KB/s if I had all the files going.

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Very large torrents have (by default) also very large pieces.

A single file has overlapping pieces at the beginning an the end of it.

This could be the reason for that what you see.

Example: torrent with 5 files, in total 20 pieces

.1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___| <-- pieces (20x size "X")
|__|_______|_|_________________________________________________|________________| <-- files

Downloading file "A" only needs piece 1.

Downloading file "B" needs pieces 1,2,3.

To get the small file "C" you need to download both pieces 3+4!

Large file "D" needs pieces 4 to 16 to get finished, means 11x size "X" + 2x pieces for start (4) and ending (16) which are shared with "C" resp. "E", so in total 13x "X" which is more than the size of the file itself.

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