When lending your computer for use by someone else, it is always a good idea to be careful with everything you can put it in. For example, a common source of viruses and unwanted files may come from external USB drives or hard drives, which easily connect to your computer via a USB port.
If you are connected to a network, there are some policies in Windows that prohibit such devices, but if you use the device outside a network range, there is a simpler trick to prohibiting the use of external USB flash drives on your device.
To accomplish this task mentioned above, you will need to make a change to the system registry. Therefore, it is recommended to create a restore point or make a copy of your important files before proceeding with the procedure. Moreover, it must be said that the procedure can be easily reversed in case you wish to return it to its previous state, as shown below.
How to prohibit the use of external USB flash drives in Windows on your computer
To perform this process, in addition to other deep adjustments to the system, you must have an account with administrator powers. Check how to proceed:
Press the "Win + R" keys together to open the "Run" window and enter the command: regedit. Press "Enter";
From the list on the left side of the screen, go to this path: HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ UsbStor;
Double click "Start".
Change the value to "4" and click "OK".
Restart your computer.
After restarting your device, when you connect an external USB device or hard drive, you will not be able to access it through Windows File Explorer. It should be noted that such a change can also affect some cell phones, which sometimes define themselves as an external storage device.
To reset this setting, all you have to do is reset access to the same record and change its value back to "3", and not delete the original record under any circumstances as this will cause you problems within the system.
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