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 Enterprise drive.  If this is the case, you will need to obtain an AC Adapter with the following specs:

Input: AC 100-120V
Output: DC 5V 2A
Polarity: External: - , Internal:  +
External diameter: 3.5mm
Internal diameter: 1.35mm