StorageCrypt

If you have sensitive information on an external drive and you want to keep it away from prying eyes then StorageCrypt is the way to go. It has two levels of encryption, quick and deep and you can encrypt and unencrypt drives as many times as you like. It's very easy to use but in case you have questions they have a user guide on their website. I have been using StorageCrypt for years, mainly to back up important identity information and my crypto wallet passwords and wallet dat files. It's a very stable and reliable program, I have not had one issue with it. The price is $29.95 But they also have a free trial available.