So I bought a 1 TB Hitachi external HDD nearly two weeks ago and today is the first chance I've had to test it out. When I plugged it in it immediately started making weird beeping/clicking/whistling sounds and my computer didn't even recognise it when I plugged it into the USB.
I've never had an external drive before so I don't know what sounds they're meant to make when switched on. But with my computer not recognising it I suspect it is broke.