Copy BDV SecretFolder in any folder of your USB Flash Drive (it must be FAT or FAT32 formatted) and start from there. After first start program will create SecretFolder on this drive. You may put there any files and folders you want to keep from any prying eyes. There are only one important button in this program. And this button do all these magic things: just press it to make SecretFolder absolutely invisible or unhide it back.