19:02 Oct 29 

thanks a lot! that was the most helpful!

15:26 Oct 27 

I tend to agree with both comments and think that putting "only" at the end of the sentence makes it stand out better, thus giving it more weight.

15:17 Oct 27 

I've been sounding them out in my American English brain, and I can only hear slight differences in connotation. I would tend to use the first phrasing if the content of the disk were specified in more limited terms, i.e. "This disk only contains the primary OS," but it would be fine in a more general sense, too. The second phrasing seems to require a number, i.e. "The disk contains only one file." Your last phrasing sounds like the way a lawyer would say it -- thus Boris's example.

12:21 Oct 27 

И использует третий вариант.
http://img83.imageshack.us/img83/4950/label32ou1.jpg
Я бы написал так же, если бы меня попросили. Но почему?