Hitachi PortableDRIVE Manual De Instrucciones página 4

CONNECTING
Connect the mini USB plug into a USB port on your computer.
The Hitachi PortableDRIVE features an attached USB cable. The drive
is powered through your computer's USB port and does not require
external power to operate.
Avoid using the USB port on Macintosh computer keyboards. This port
may not have enough power to adequately support the USB 2.0 interface.