block & unblock usb

to block USB mass storage device & to unblock USB mass storage device
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HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR proceed further.

To disable access

REGEDIT4

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR]
“Start”=dword:00000004

To enable access

REGEDIT4

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR]
“Start”=dword:00000003

Copy the required code to a text file and save it as *.reg file. Just open that file and information will be added to the registry.