Why does Transmission create extra files?

Question

linux

I'm downloading a torrent with the Transmission client in Ubuntu. There are 3 files in the distribution, I mark only one for download, but the other two with the .part extension are still created in the target folder. I'm not greedy, but they are immediately created in the final size, 5 GB each, and this is already expensive. How to be? Nothing like this happened under Windows in uTorrent.

Answer 1

but they are immediately created in the final size, 5 GB each

Are you sure these are not sparse files? As far as I remember, when I used transmission a long time ago, it did not create whole files, but only sparse ones.
The bottom line is that all files when creating a distribution go as a stream of bytes. This stream is divided into chunks of a certain size. So, this chunk can capture the end of the file you need, and the beginning of the unnecessary one, but you cannot download it partially, only the whole chunk. Well, and, accordingly, if you suddenly come in to download, the client saves this particular small piece.
Maybe you have a file system that doesn't support sparse files?

Answer 2

This is a feature of the Torrent protocol, when the giving side simply gives without asking if you need this part, and Transmission saves it for some reason.