hi 

to do that 

1. Open Registry Editor.
2. To open Registry editor just type “Regedit” with out quotes in RUN and press enter.
3. In the Registry Window find HKEY_LOCAL_MACHINE.
4. Under HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/USBSTOR
5. In the Right partition of window you will find many options.
6. Go to Start option and double click on it to change the settings.
7. A DWORD popup Window would open.Change the value to 4 in the value data box.   *Note:Always Check the box with Hexadecimal Value.
8. Click on the OK button and Close the Registry Editor.
   Restart your PC to see the result.