Thanks for the reply's. I am aware of the other threads but they did give a direct answer.
My hard drive is WD caviar green WD20EARS 2TB set up in standard mode. This might be stupid of me but what do you mean by the 'switch'?
Dam, didn't see that thread on how s**t WD hard drives are in NAS before I bought it.
I was also planning to upgrade my WD HD media player to the Live version which networks, but will these slow speed affect playing HD films?

Thanks