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Aug 10, 2011

USB Device Not Recognized - Solution

USB Device Not Recognized
This problem occurs when no device is connected to a USB port. That makes the USB driver set the Open Host Controller Interface (OHCI) controller to a suspended state. When the OHCI controller is in a suspended state, it cannot always detect when you add a new USB device to your computer.

SOLUTION:-
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* Click Start Menu -> Go to RUN

* Type REGEDIT
Registry Editor will open.

* Locate to [HKEY_LOCAL_MACHINE->SYSTEM ->ControlSet001 -> Services ->USBstor]

* Find "Start" in the right panel

* Double click "Start". A box titled "Edit DWORD value" will open.

* Write down "3" in the "Value Data" Field.

* Click OK and then close the Registry Editor.

Your USB flash drive is now Enabled. You can Disable it also By Putting The value as "4"

Note:-
This trick will only Enable/Disable USB Mass Storage devices and will not affect other USB Devices such as USB Keyboard, USB Mouse, Scanner, Printer etc

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