Hot-Pluggable; Fanless Design; On-Off Switch - Acomdata External HARD DRIVE USB 2.0 User Manual

Hot-Pluggable

You can connect/disconnect the Drive while your computer,
and the Drive itself, are running (i.e. "hot").
Fanless Design
All hard drives generate heat during normal operation.
However, your AcomData Drive was engineered to dissipate
heat so efficiently that it doesn't need a fan. The results are a
sleeker, more compact design, and near-silent operation.
On-Off Switch
It's a simple thing, but it's powerful too. The on-off switch
allows you to save electricity by turning the Drive on only
when you actually need to use it. Furthermore, if Password
Security is enabled you can reduce the risk of others access-
ing your files when you leave your computer unattended.
(Sure, someone can always turn on the Drive, but unless they
know your password they won't be able to access your data.)
Unmount the Drive before you turn it off or disconnect it. See "How to
Properly Turn Off and Disconnect the Drive" for details.