Which power USB hub uses if it has external power supply as well

Posted by Mirage on Super User See other posts from Super User or by Mirage
Published on 2010-01-20T06:21:23Z Indexed on 2010/04/21 15:54 UTC
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I have 7 port USB hub with external supply.

I tried turning it off by removing external power but then it takes power from motherboard and is still working.

I have many external hardrives connected to it.

i was worrying if i turn off the power it may damage the motherboard by withdrawing so much power from that USB

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