Search notes:

Registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR

Start

If the value of Start is 3, USB storages can be written to, if set to 4, USB storages cannot be written to.
Compare with the value of WriteProtect under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies

Index