after leaving my comp idle for few hours and i play some music the hdd will produce some ticking sound, and often alot of times after few hours of usage of my comp, the hdd will be producing those sounds again if i stop playing music and play it again.. anything wrong with it?

another question is if i install MBM or Speedfan while running my ASUS probe the asus probe will keep come out warning sounds, sometimes it write CPU fan speed 0, or the voltage drop to really low or went really high. i not sure about the voltage part but when it says cpu fan speed is 0, i look at my cpu fan (i removed the side casing ever since i get my WD120GB) and its running. so does it means that the sensor went crazy or the softwares cannot work with each other?

btw im using only 1 WD120GB harddisk as OS and storage, with few partitions

my hdd often ticks quite loud especially when loading or writing files, what worse is its just about 5 months old, really dam worry when heard it ticking