Normal harddrive noise

What would be considered normal hard drive noise? I got a new macbook pro a couple of days ago with the 5400 rpm 160 gb drive. My hard drive spins constantly and I can here a soft "tick" noise from the head occasionally. The head seems to park itself every once in a while also and makes a soft "ping" like noise and when it starts moving again I can here the whir of the head moving back and forth. It also makes that soft scratching like noise when I open an application. Is this all normal? I don't remember if it did all this from the start but I noticed it yesterday and now its hard not to listen for it and its annoying. None of the noises are really loud, the room has to be pretty quiet to here them. I have no idea what to listen for in terms of good or bad hard drive noises so thats why I'm asking. My computer seems to be running fine right now its more of an annoyance than anything else. So are these sounds normal? Thanks for any input.
macbook pro Mac OS X (10.4.9)

Kwarp- my hearing is pretty good, probably about average, I here the harddrive spinning always (my fans are rarely on), the ticking or clicking (its very soft I dont know how to describe it) occurs randomly, I do get the scratching "thinking" noise when I open applications which im guessing is normal.
ultraneo- I have a fijitsu 160gb according to the disk utilities, I guess the ping could be described more as a "clink" sound and it happens only about once every 10 minutes or so but it always starts up again almost immediately, then sometimes it does the same thing a few seconds later. None of the noises are very loud, I can barely here them when my air conditioning comes on but they're still annoying.
Now that I think about it, the main sound I'm getting is the thinking/scratching noise but its happening frequently (but only in very short bursts or just one at a time which is why I called it a tick) even when I'm not opening applications or doing anything for that matter. It basically sounds like my hard drive is always working even when I'm doing almost nothing or am just on the internet.
..that 2nd reply was supposed to be marked as helpful, sorry...

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Normal harddrive noise

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