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Clicks or ticks every minute when HDD is idle

My HDD is a My passport... It's 2 weeks old. I hear this tick or click followed by another one about 8-9 secs later, and they repeat every minute almost exactly... They usually happen and the LED light blinking..

It's not like the other clicks you hear that indicate any inevitable HDD failure, it's much lower in volume. I don't know what that is, however it's different than the rest of the HDD usual sounds...It's close to the sound of the mouse click.

It sometimes also happens when I access a file on the drive mostly after being idle for a while, sometimes randomly not really sure...

The drive though is working well, the SMART report comes out OK and without warning, and disk management shows it healthy... What could be the cause of this??