Odd noises from my laptop harddrive, advice on how to proceed?

Soon after I bought my laptop, the harddrive would occasionally make a beep sound and a couple of times the performance would be really really bad. Recently after downloading a 200mb file right upon completion of the download there were a couple of long beeps (much longer and more then one beep) that seems to match up with the download being completed. I got scared and made sure to downloaded macrium to create an image that i can use if something went wrong. Now in the last few days I have been getting a couple of blue screens and I am wondering if I should just go and buy a new harddrive.

http://datacent.com/hard_drive_sounds.php
the sound I hear is very similar to what I can hear from the first clip under "Hitachi/IBM", its called " Hitachi laptop drive with bad heads clicks once on spin up, then beeps". I dont know if the difference in brand means anything.

my harddrive is the "596GB SAMSUNG HM641JI" and is (i believe(?) out of warranty), I bought my laptop dec 2011.

I used seatools to scan do a short test and it passed, it is currently doing a long test and I will post back if it fails that test, otherwise please assume it passed.
Outside from the times where a sound is produced, I have not had a problem, its basically been a full year since this started?

Could someone please give me some advice on how to proceed?