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What is the difference between an external USB 2.0 hard disk that needs a power supply and one that does not require a power supply?
Wiki User
∙ 19y ago
A USB hard disks that does not require a power supply is powered by your computer via the USB connection. Where as others require an external power supply because of the amount of power they require. It is usually a "wall wart" type that plugs in to your wall socket with a lead that plugs in to the disk drive.
Wiki User
∙ 19y ago
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