powered USB ports?

are all usb ports that come pre-installed on desktops and laptops powered? I'm talking about the ones that are either part of the motherboard or PCI.
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rayt333Connect With a Mentor Commented:
Like magarity stated usally they are powered but most only have a small amount to power an external device, if you are installing a device that requires a high load then you would be better off with a externally powered USB hub.

You will need to check the power requirements for the device and also see how much is available from the USB port.
Usually, but not always.  Check the manual for the motherboard or laptop in question.


USB ports should provide up to 500mA of current at 4.5 volts.  Some laptops, however, do not provide any power at all since they don't really have much to spare.  Strictly speaking they are not USB spec compliant but that's life...

In general the specification for your laptop should define how much power, if any, is available to be drawn from the USB port.
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USB ports should provide up to 500mA of current at 4.5 volts

Actually, each of the ports is allocated 100ma. Besides the hub controller requires 100ma, you have 400ma left, which means, one hub has up to 4 ports, if bus-powered.

Well, in the drivers codes, all of these ports are powered up, actually, the port status is 0x0000100.

Maybe too much info to you.

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According to PC ISO, all onboard USB ports are powered, albeit usually by not much.  rayt333 has the correct answer.

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