Abnormal Noise every 20 seconds (X301)

I bought the x301 thinkpad 4 months ago. Now, I keep hearding abnormal noise originated from the righ side of keyboard.
It's low picth, 1-2 seconds long and coming out every 20 seconds. Sometimes, it's totally gone.
It sounds as the dvd reader is running for 1-2 seconds. Should I concern? i would like to bring it to the lenovo center but i need it for working on my final project.
Any suggestions?
Thanks!

Finally, i successfully fixed it!
I removed the dvd drive from the slot and put it back, secure a screw at the bottom of laptop.
Now, all abnormal noise gone!

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