Thank you for your replies. I didn't know/notice that you could pause downloads during unrar. First, my download is not that fast, it's 1000 KB/s. Do you think that can cause anything? Even if I pause I don't think it will help. Just unraring in the same drive is not a good thing for large files I think. When you unrar on the same drive, you are reading and writing at the same space heavily.
I will tell you exactly my situation. As I said it's during playing games, and especially Call of Duty MW2/Blackops multiplayer. At the start of the level, where you see a progress bar on the map and doing unrar at the same time, it gets real slow and I miss the game. I think at that point, the game is writing or decompressing the map into the drive and that slows maybe?
The 3 drive solution is really too much for me. i want to go with 2 but which one?
I kind of think about
Drive D: Games + TF + DF
Drive E: UF
instead of this
Drive D: Games
Drive E: TF + DF + UF
because the unraring will be done on another drive and it should help alot.