And for those who complain about the lack of switch:
There are enough possibilities it off anyway:
1. Plug pull out (somewhat cumbersome).
2. Click the icon in the taskbar ("Safely Remove Hardware") simply turn off.
3. Easy tool "WD spindown or Stop Utility" from the Western Digital Homepage Download: So you can send the drive with a single click in the standby mode and then back on.
4. Just wait. For me, the hard drive automatically after 15 minutes in standby mode and activated again if you want to access it.