[snowcrash]

Thanks for the replies so far.

Though the noise isn't the usual low level type sound the hd when it's spinning. This is more like a high pitched squealing sound which slightly varies in pitch. Only happened twice, and like I said, the unit is working perfectly. It only happened on immediate connection to the pc and continued until switched off.

It's one of those 'faults'/issues that is very rare, can't be simply reproduced. So if I did send it back, likely to say there's nothing wrong with it as it won't happen during testing.

sc