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Windows 7: Too much power on USB?

27 Jun 2010   #1

Windows 7 Home Premium
Too much power on USB?

Hi there

I recently hooked up a USB wireless card, one from Rosewill. When the Rosewill is plugged in, my iPods won't show up in windows.

This is the thing though: when they are both plugged into the back of the mobo, the pods won't work, but if I plug the pod into the front bezel usb ports, then they work. I see that the Rosewill is drawing a full 500 mA of current. Is it possible that plugging both devices up to the same USB hubs draws too much power, and then they don't work right?

I've never encountered this before.



My System SpecsSystem Spec
27 Jun 2010   #2

Vista 64 Ultimate, Windows 7 64 Ultimate, Ubuntu 9.10

You only have so much power dedicated to the onboard USB ports based on the circuitry for them on your mobo, each is different. If you have some devices that are power hungry or on the verge of needing supported power then I suggest a power supply backed hub. Not only will you get more USB connections you'll put less drain on the power from the mobo.
My System SpecsSystem Spec
27 Jun 2010   #3
Product FRED

Windows 7 Enterprise 64-bit

fishnbanjo is right. Also, some USB ports supply more current than others. Also, if you have any USB 1.1 ports, that could be an issue, although I doubt you do. The solution is to keep them plugged into different hubs.
My System SpecsSystem Spec

27 Jun 2010   #4

Microsoft Windows 7 Premium (OEM)


I had the same problems with the hugh USB ports I need for my sounds devices setup. That was september last year, and I was really forgotten to ask a self powered USB-Hub. Later a more hardware-minded freak as me took one look en told me to buy a self powered Hub. Took a few seconds before I get the reel point indeed.

With the self powered Hub is much easier to work. It's USB 3.0 Compatible
My System SpecsSystem Spec
27 Jun 2010   #5
Phone Man

Windows 8.1 Pro w/Media Center 64bit, Windows 7 HP 64bit

You can pull up Device Manager and look at each hub and see what is available and what each unit is drawing.

Too much power on USB?-usb.png


My System SpecsSystem Spec
28 Jun 2010   #6

Microsoft Windows 7 Premium (OEM)

Ok, got it. Thanks.
My USB-HSDPA Internet Dongle is taking a lot off current. When I sent a SMS it's taking 430 mA.

Now I also know, why my battery is giving it up after about 30 minutes instead of almost a hour when I'm mobile connected to my server @home.
My System SpecsSystem Spec
30 Jun 2010   #7

Windows 7 Home Premium

Thanks for the replies everyone. I will just keep them plugged into different hubs.
My System SpecsSystem Spec

 Too much power on USB?

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