Make Write Protect Pendrive

1.Go to RUN -> Type regedit & press enter, allow dialog box  -> select  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ 

2. Create new key named "StorageDevicePolicies"

3.  Right click on this & create a new -> DWORD (32-bit) Value & named "WriteProtect"

4.  Double click on it & set value 1, if want to off it set value 0.