Do you know what is this "WD Unlocker" VCD and for what purpose it is done ?
The WD drives with this logo on the box support hardware encryption of the data. You can password-protect the drive so that others can't access it.
The bits and pieces necessary to do the locking/unlocking are on the Unlocker VCD. They have to be with the drive so that the drive can remain portable. Otherwise, if you lock the drive on one computer, you won't be able to use it at a friend's house or at work.
But if all you wanted was a simple USB drive without the hardware encryption utilities, why did you buy a Passport and not one of the plain USB drives that don't come with the VCD or any other applications? Then you wouldn't have to scramble around trying to hide the VCD.