Seems I have the same problem as everyone else.
Using a Toshiba Qosmio X505 and HP DV7 so bought 2 of these; 1 for each notebook. The enclosure is simply not getting the power required to spin the drive properly... the HDD is not detected via your express card, but is vias standard USB 2.0.
This is quite disappointing and frustrating.
I have emailed support, as per the other threads... waiting patiently and frustrated.