Transmission

If I already have files of some torrent so how to disable a checking of such files.

For example:
I had download about 20 GB from some torrent.
After it on site where I download torrent that one had chang. added one file to torrent.
Every time transmission checks all! files.

Example about feature that I want to say (by uTorrent example):



I use transmission as cli port for FreeBSD. Known English not very much. Sorry.

Help please.

Simple answer is that just because You know that the data is the same does not mean that the torrent-client knows it as well. Using existing data without checking it makes you running the risk of sending out incorrect pieces.