New VelociRaptor WD3000HLHX 300 GB Noises

Hi well your dive has a 5 year warranty if HD sentinel is telling you it is ok I would go with that. Just run hd sentinel once in awhile to keep a eye on it. Don’t worry about it HD sentinal will let you know long before it fails if it ever will. I like the raptor drive’s my 300 gig ones are 4 years old now and not a problem. By the way for a person that does not know about computers you have done well to get a new drive installed and working keep at it. The main thing you want to do is before you open any pc case is unplug the power cable and then push the start button  on  the pc case to drain any left over power from the psu and motherboard then it is safe to work on, of course ground yourself to the case by simply touching it.