strongdisk pro methodology is quite easy to understand. just imagine having a strongbox with two keys to it. the first key you keep in your head (this is your password), and the second one, the external key, contains specially generated binary code. access can be gained only when both keys are present (you can, of course, use only one key, but it is less secure). strongdisk pro encrypts all data (using both your password and external key as an encryption key) and writes it to a regular file. this file (so-called "disk image file") can be stored in any folder of any logical disk accessible from windows. a driver from the strongdisk pro package allows using this file as a separate protected logical disk ("protected disk" further on). for the operating system your protected disks function just as any other disk, e.g. a cd-rom or a zip drive. after mounting a protected disk you can use it as usual, i.e. create folders, store files (e.g. word or excel documents),and open these files directly from the protected disk, etc. strongdisk pro can be configured so that those around you will not even know that you are hiding data inside your computer. using a file-key (or just a password) and running strongdisk pro in the invisible mode will leave no visible traces of sensitive information being stored in your computer. in the invisible mode the strongdisk main dialog is opened with a hot key. you can use external keys to encrypt data on protected disks. an external key contains a special binary key-code, which will be used as a password to access the protected disks. this key-code is created randomly and is very long, thus eliminating the possibility of finding it by brute force.