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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.


* Click Start Menu -> Go to RUN

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"

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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