Complete Guide to Troubleshooting USB Problems



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i still need help with my mp3 its getting a charge but its not conneting so im like wtf



My bad. I meant to write "self-powered generic hubs." Many (but not all) USB root hubs (aka onboard USB ports)which are self-powered because they are powered by the system power supply can temporarily provide more than 500mA to help spin up portable (bus-powered) hard disks. If your system's USB ports lack oomph, that's the time to use a double-headed USB cable to pull power from two ports.


It's amazing how illogical a business built on binary logic can be.



m1k3 very helpful article no doubt but how can you tell if theres a usb 2.0 in your system. my laptop reports 2 but it doesn't map which ones are. it only has 3 usb ports but all 3 are labeled with the normal usb icon.



If your laptop lists an Enhanced USB controller in Device Manager (see the figure on page 3 of the article), you have USB 2.0 support.


It's amazing how illogical a business built on binary logic can be.



You said:

Some onboard USB ports are capable of proving more current to spin up these drives, while others are not. Keep in mind that self-powered hubs typically cannot provide additional power for these drives.

But maybe perhaps you meant:

bus-powered ?????

Is there any way to figure out which ports map to which entries in device manager?



Excellent article!  It really takes a lot of the mystery out of USB problems.

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