[Hard drive issue?] PS3 is making weird clicking noises

So ever since I bought this Seagate Momentus 250gb 5400 RPM HDD to replace my original 40gb HDD. I noticed that when I am downloading something from the playstation store or playing games it makes a loud clicking noise which I'm assuming it's coming from the hard drive since it never made these noises with the original 40gb HDD. I actually wouldn't mind the noise IF there wasn't this one problem I am having when I play Assassins Creed 2. On every cut scene it makes the clicking noise and i noticed when it makes that noise it lags the the voice and the mouth movement so it results in it being out of sync, it does go back to normal when the cut scene is over but it is very agitating. It also makes the clicking noises during the "counter" move animations when you're fighting and it'll also lag the sword piercing noise when it makes contact with your enemy and it goes out of sync. So what i'm asking is... is this normal with laptop HDDs? or is the one that ive put in my PS3 just messed up. I'm thinking about switching to a Western Digital HDD or just buying an entire new PS3 but i'm gonna wait till I know some answers. Any help would be appreciated on this matter, thanks guys.

 

Ok thanks for the heads up, looks like i'm backing up data and see what i do from there.