2. Click Find, Find Handle or DLL in the Tool Menu.
3. Type the Drive Letter of the USB Storage Device in the Handle or DLL substring textbox, and Click on Search Button.
4. Find the process and its PID in the following box.
5. In system process tree view, find the process according to the Find Handle or DLL dialog box.
6. Press Ctrl + H to show Handles in Lower Pane View.
7. Find the File according with the drive letter , and right click it, choose Close Handle.