Strange sound/noise - hard disk fault?

Hi,
I have a problem with my new Lacie Network Space 2 and would be pleased about some hints:
I'm using the current official firmware and everytime the hard disk is idle running, it makes a strange sound (short squeaking) periodically every two minutes or so. I suppose it's every time the reading head moves to stand-by position. Apart from that (reading/writing) everything sounds okay.
The hard disk also sometimes makes a strange sound, when the LAN cable is connected.
Here's a sound file (2 seconds pause between each part):
http://euint.de/div/geraeusche.mp3
1. The sound i'm talking about.
2. Connecting LAN cable and similar strange sound at the same time.
3. Reboot sound.
Should I return the NAS or are these common sounds?
I have a problem with my new Lacie Network Space 2 and would be pleased about some hints:
I'm using the current official firmware and everytime the hard disk is idle running, it makes a strange sound (short squeaking) periodically every two minutes or so. I suppose it's every time the reading head moves to stand-by position. Apart from that (reading/writing) everything sounds okay.
The hard disk also sometimes makes a strange sound, when the LAN cable is connected.
Here's a sound file (2 seconds pause between each part):
http://euint.de/div/geraeusche.mp3
1. The sound i'm talking about.
2. Connecting LAN cable and similar strange sound at the same time.
3. Reboot sound.
Should I return the NAS or are these common sounds?