I have a Lenovo T61 with a Seagate 100GB hard drive. I hear this small clink noise from the hard drive as it sits idle with the screen saver on. While I'm running a defrag or an error check then I do not hear the clink.
Error check says no problems, Seatools says drive has passed.

I read somewhere that some of these Seagate hard drive will park its head and makes a small clink. So is this true about this certain drive or should there be no clinks at all.

Note: this is not a constantly clinking. It happens maybe once every 10 minutes while running idle with screensaver. I am going to actually time it and give you an exact number of minutes that it does this.

The laptop runs 100% great, no problems and fast.

Should I be concerned about this clink?

I have posted this question on other sites as well.