I'm struggling with a very annoying issue: My new hard-drive (Samsung Spinpoint M8 1TB (HN-M101MBB) was build in an USB 3.0 external case (Lian Li EX-10QR) and formatted with ext4. When this hard-drive is connected to my Notebook via USB 2.0 it "klicks", the LED flashs too, every second, but only when it's idle! It stays silent, when something is copying or reading from it. But when this drive was formatted with ext3 or fat, it always remained silent. This also happens with a Western Digital WD10JPVT Scorpio Blue, but the "klicks" are even louder! System: 12.04 64-bit with Gnome-Shell. Any ideas how to approach this issue?