Hard drive low pitch grumbling noise *sound attached*

Recentley my 1tb hard-drive has starting making these low pitched grumbling noises almost like a vibration when its being accessed. I notice it most when im defragmenting or gaming

It does not happen when i defragment my other hard drive

heres what it sounds like, fans quite loud but you can hear it slightly
2shared - download HD grumble.mp3

How old is this drive?

This might be due to the aged parts inside the drive. My 5 year ols hdd did the same thing, disk health utilities said that there were no problems (these utilities are very reliable and can calculate the life expectancy of a drive, it has saved some of my friends from loosing data)
I bought a new drive, I was building a new machine either ways...

If you find it annoying you can return it or buy a new one, you can use HDD sentinel to find out if it going to break down.

It's not that old i've only had it for about 1-2 years
heres some specs from HDD sentinel

Current temp 28c
Max temp in liftspan 44c

Health 100%
Performance 100%

Power on time 212 Days 2 hours
Estimated lifespan 1000+ days
Total start/stop count 1,713

if you need anymore info i will look, im new to HDD sentinel XD

It could be the motor bearing going bad. Regardless of age, drives will sometimes fail sooner rather than later...and this looks--er, sounds like an early warning sign of an eventual breakdown.

You can continue using the disk but be prepared for the possibility of losing all data on it. In other words, start making backups of anything important and keeping them current.