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Dec 4, 2017 at 13:53 vote accept Joe
Dec 4, 2017 at 13:52 comment added Joe Yes, you are right. When the pc is switched off, the Vbus of USB is still on and the power go from Vbus USB to the 5V wire of the disk drive. I solved putting a diode between the 5V wire of ATX and USB Hub. Thanks for your reply.
Dec 3, 2017 at 13:27 history edited Dave Tweed CC BY-SA 3.0
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Dec 3, 2017 at 13:21 history answered Dave Tweed CC BY-SA 3.0