“why have a power supply if you don't need to use it it has a usb and an external power supply, why both??Why the external power.”

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• The USB port cannot provide sufficient power to run the external hard drive. Therefore, an external power source is required.

  Answered by slatjam 10 years ago

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• The external power supply makes it easier to use straight out of the box without have to perform installation.

  Answered by CommunityAnswer 11 years ago

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