Lock your folder using CMD

Now you can lock Folders by just using simple Command Prompt Commands. This trick uses the built-in functions of Windows. This command strips the user permission from everyone, which makes it an Access Denied folder.

Create a folder you want to lock anywhere in any drive (but the drives should be in NTFS format).

NOTE - The name of the folder should not have any spaces in between (in our example we used the name Folder_Lock).

(If you want to lock a folder that is in your USB Flash Drive, right-click on your USB flash drive and click Format... and select the File system as NTFS and click Start.)

Open Command Prompt by pressing Windows Key and type cmd and press Enter.
Redirect to the location of your folder,

How to redirect:

Firstly, if you want to change the drive, type the drive letter followed by ':'. For example in our case, we will lock the folder in J Drive so j:.

Secondly, copy the location of your folder from Explorer. Go to the location and click on the address bar and press Ctrl + C.

Now go to the command prompt type cd<space> and press Ctrl + V to paste the location.

Now type the following code:

Syntax: cacls <folder_name> /p everyone:n
Example: cacls Folder_Lock /p everyone:n (The name should be the same with upper and lower case letters)

Press Enter and the command prompt will ask for confirmation, press Y.

Done! Now when someone will try to open the folder will get an error.

How to unlock

Open the command prompt and redirect to the location of your folder.
Type the following code:

Syntax: cacls <folder_name> /p everyone:f
Example: cacls Folder_Lock /p everyone:f (The name should be the same with upper and lower case letters)