Hdd Issues In Reason (amongst Other Apps?), hdd clicky noise (faint) Options

[prosthetix]

in my powerbook, my hdd is making a clicky noise (very faint) once in a while.. did a disk utility check repaired the disk (nothing came up as a fault) did a hardware test too... Should I be worried? like a pop/click... ahh hard to explain, it doesn't SOUND serious as such... is there any way to do a good check to see if any bad sectors on the hard disk or anything like that? (would i need to make a partition of my current macintosh HD (its an 80gb at the moment)

in reason 3.0.3, sometimes during playing the track in the sequencer, it'd stop for half a second with no sound, and continue on, maybe less than half a second

running 10.4.2 w/ 768mb ram... any help would be appreciated, cos if this will happen live, i'll be in strife