Having recently acquired a 1TB WD My Passport SE USB 3.0, I would hate to destroy it. I noticed it shuts down when removed from a Windows system safely, but simply unmounting under Kubuntu via the Device Notifier applet does not have the same effect. Naturally, I become worried about destroying my device.
Fortunately, there is a solution to this. Yan Li devised a script that will correctly power down a USB drive so it can be safely removed. It works great with my WD Passport. Should work for any USB drive though.
It’s necessary to install the sdparm package for it to work, but otherwise works out of the box under Kubuntu 10.10.