Start Best Disk Lock, click the the "Lock disk" button on the bottom right corner of the window, select the drive you want to lock and the lock level in the pop-up window, and then click OK.
Elementary-lock: The locked disk cannot be seen in My Computer or Windows Explorer, but you can access to it with command line (cmd mode).
Intermediate-lock: The locked disk cannot be seen in My Computer, Windows Explorer or command line; but it can be accessed after reinstalling system or replacing the computer. Usually we recommend you use the intermediate lock.
Advanced-lock: The locked disk cannot be seen accessed in any environment, even reinstall system or replace computer.
Start Best Disk Lock, select the disk record you want to unlock from the "List of locked disks", and click the "Unlock disk" button on the bottom right corner of the window.
Start Best Disk Lock, Start Best Disk Lock, click the Control USB button, tick "Disable USB storage devices" or "Set USB storage devices as read-only" accoring to your own needs.
Start Best Disk Lock, click the first button (from left to right) in the upper right corner of the window, and select "Modify Password" from the dropdown menu (the default password on trial version cannot be changed).