Any strange noises from an HDD is not something to ignore....:-)
More often than not it signals it will eventually expire, so a rapid backup is essential.
It could be that, despite the fact it's new, it's been knocked or dropped before it reached you.
Could be worth seeking a replacement under warranty.
Sorry to sound so pessimistic but having had an HDD expire on me a couple of months ago (the first time I've suffered in this way even though I've owned around eight or nine over the years) I'm inclined to take the safety route.
To that end I acquired a Western Digital with the model number ending in JB, which provides a three rathr than one year warranty.
However, WD has changed this system a little as some of the JB models don't have the three year cover, whilst adding PB to the lineup.
If you check on, say, Scan's hard drives page at:
you'll find out which WD drives have the extended benefit.