You may use an External AC Adapter to use with the DataLocker Enterprise drive.  Some older system cannot provide adequate power through the USB ports to correctly power on the DataLocker drive.  If this is the case, you will need to obtain an AC Adapater with the following specs:

Input: AC 100-120V

Output: DC +5V 1A

Polarity: External: - , Internal:  +

External diameter: 3.5mm

Internal diameter: 1.35mm