Any USB devices and peripherals that use USB mass storage drivers are capable of transferring data in both directions. Windows recognizes these drivers as devices that have a formatted storage area. Therefore, you cannot use certain USB devices such as flash disks if you or some other program disabled the USB mass storage devices. You can enable them once again by editing a value in the Windows Registry. But, you must have Administrator privilege to perform this task.
Instructions
Instructions
Click "Start," go to "Run," type "regedit" in the text box and press the "Enter" key on your keyboard. If you are using Windows Vista or Windows 7, type "regedit" on the Start menu search bar. This will launch the Registry Editor.
Click the plus signs to expand the left pane in the Registry Editor and see different keys. Start by expanding the "HKEY_LOCAL_MACHINE" key and then scroll down until you see the "SYSTEM" key. Keep expanding until you reach the "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR" path. If you did it correctly, you should see various names, including "BootFlags" and "DisplayName" on the right pane.
Double-click the entry labeled "Start" on the right pane and change the value to "3" without quotes to enable USB mass storage drivers. Close the Registry Editor.
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