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USB 3.0 HDD power?


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I should have a new computer in about 2 weeks and it will be my first exposure to using USB 3.0.  I have a USB 3.0 HDD I've been using on USB 2 on my current computer.  So, I have to have the drive's power cable plugged in in order to power it.  However, wasn't USB 3 designed so the USB 3 cable could supply power to the device, too?  If so, does it supply enough power to power a USB HDD?  Will I still need to plug in the power cable to use the USB HDD?

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