I have one other supplementary question. I remember noting when I bought the computer that it has two USB ports and two USB2 ports. But having lost the blurb that came with it, I can't remember which is which!
There are no markings on the case by the ports, and so far as I can see Device Manager doesn't show which ports are which. How can I find out which ports are USB and which are USB2?
It's an HP Notebook - Pavilion DV3-2000 series. I've had a look at the manual on the HP website and it shows where the 3 (not 4 as I said above!) ports are - 2 on the left together and one on the right built into an e-SATA port. But it doesn't make clear which are USB and which are USB2.