hi, been borrowing a hard drive for my vu duo as wanted to see if i would use it before buying one, have found out im using it all the time, was looking at a western digital one 500g which is 7200rpm, but for 10 quid more i can get a western digital 1tb, but its a green one which usually means 5600rpm, will this still be ok for the vu duo ? will it make any difference or not,