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"USB Root Hub" vs "USB Root Hub (xHCI)" in DeviceManager?


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#1 MRich520

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Posted 24 August 2013 - 08:50 PM

My laptop (Razer Blade 14", running Windows 8 x64) has three USB 3.0 ports. In Device Manager I see three "USB Root Hub"s (each corresponding to an individual USB port...?) listed, except one of those three is followed by "(xHCI)". Does that mean that that one port is different in some way from the others?

 

I'm asking because I have a (supposedly) USB 3.0-compatible external enclosure for a hard drive that I took from my old computer, but it only works when I plug it into one of the three available USB ports. In the others, its activity light turns on but the drive never spins up and isn't listed as connected in My Computer. After seeing one root hub appear different from the other two in Device Manager, I was wondering if the (xHCI) port might be special in some way and as a result be the only port that supported the external hard drive.

 

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#2 jhayz

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Posted 24 August 2013 - 10:06 PM

According to wikipedia... on XHCI. http://en.wikipedia.org/wiki/Extensible_Host_Controller_Interface

In the others, its activity light turns on but the drive never spins up and isn't listed as connected in My Computer.

There could be a low power rail supply on the USB root hubs. It could also be from the enclosure makers sometimes as there are different chip support. The xHCI seems to support all these functions with regards to power, drivers and compatibility. See link for more details.


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