Sorry, my bad - I didn't even know Toshiba made hard drives until now! I can't find a Toshiba utility anywhere either. This is the closest I've found:

http://www.disk-utility.com/toshiba-...-software.html

However I've come across these people before and they only seem to pretend to have the utility, in fact they want to sell you their own product. However that's available as a demo version if you want to give it a go.

Noises from HD's are a very bad sign, I've got to say, and if you're pretty certain that it is the hard drive that's making the noise then I think we can safely say that that is where the problem lies.