It can encrypt the drive having capacity greater than 4GB. When we execute the file it ask for the password to encrypt the drive. It install a exe file on our drive and hide the content of our drive that is file and folders. An audit back in 2016 revealed a lot of security flaws, but they were quick in patching them all up and security Free USB Security is free USB encryption software used to encrypt the drive by using a password provided by us. As far as free encryption services go, VeraCrypt remains one of the best around.Rohos Mini Drive is a free software to protect USB flash drive with password. There is a free trial version available but it is restricted to 10 uses only. USB encryption software helps you to lock your important data with a is a good idea to use a password and encryption to protect your vital USB drives.