Plextor PX-755UF Installation And User Manual page 24

Section 2. Installing the PX-755UF External USB/FireWire Drive
Figure 3: Connecting the AC adapter and USB or FireWire cable
The drive should be automatically recognized by the computer. In some
cases, you may have to reboot (turn the computer off, then on again) for
the PX-755UF to be recognized.
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PX-755UF Installation and Users Manual