Western Digital WDBAAAR5000ABK Elements Portable External Hard Drive - 500GB, USB 2.0, BlackItem#: W10-9020  |  Model#: WDBAAR5000ABK-NESN

• You have a desktop with ample USB ports, or

• You have a laptop and you need to take your Bus Powered devices with you, or

• You only use the device intermittently and want the simplicity of no external power adaptors, or

• You want to keep desktop clutter to a minimum, and want to eliminate power cables.

The best example of a USB Bus Power devices are: USB Thumb Drives, or Passport style USB Hard Drives.

Rules for best results with Bus Powered Devices:

• Use a good quality USB Cable two feet or less in length.

• Be sure to directly connect the device to your computer, instead of through a hub or other device - unless the USB Hub has its own power.

• Make sure your laptop battery is fully charged.

Generally speaking, you do not want many Bus Power devices connected at once, especially on portable devices or laptops running on batteries. So consider unplugging unneeded devices if necessary.

Some devices can be powered both by an external adaptor or by Bus Power. As a general rule, you should use the external adaptor to power the device, except when you need to use it and external power is not available. However, higher-consumption devices, such as external optical media burners, and large hard drives, may work best with external power.

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