Adaptec ACS-120 - Manual (Page 11)

10
Connecting the USB Y-Cable to a Second USB 2.0 Port
If you have another available USB port on your computer (does not
have to be a USB 2.0 port), plug in the Y-cable’s secondary
connector. The secondary USB connector provides additional
power to the enclosure.
Connecting an External Power Supply
If the USB Y-cable does not supply enough power, try connecting
an external power supply (not included) to the power port on the
enclosure.
The external power supply must meet these requirements:
■ Rated at 5 Volts
■ Capable of 1–1.5 Amps (depending on disk drive power
consumption)
■ Connector size:
■ 3.5 mm outside (-) diameter
■ 1.35 mm inside (+) diameter
■ 10 mm length
Plug secondary connector
into any other USB port
for additional power
Plug into the enclosure
Plug main connector into USB 2.0
port for data and power connection