Intending to use the Hard Disk internally in his notebook. One of my colleagues cracked open his 1TB Western Digital Essentials USB drive and was greeted by this.
WD didn't just stick a simple 2.5" SATA drive onto a SATA to USB board and then put it in a case. WD CUSTOM MADE a hard drive interface board that has said SATA to USB functionality included. So there's no SATA port on this hard drive and thus sales of this external drive won't cut into sales of their actual notebook drives since you can't just easily rip apart an external drive and use it in your notebook.
Even if this thing had a normal SATA connector. This 1TB drive is thicker than a standard notebook drive and wouldn't fit in a standard slot anyway!