Hi, I have several hard drives full of personal documents (pictures, videos, etc) that I connect to a USB3 docking station whenever needed. I would like to password encrypt these drives. Can I do this with Truecrypt or Bitlocker? Which one is better? Will I risk losing all data during the encryption process or is it a safe operation? Most of the tutorials in Youtube describe how to encrypt system OS drives but not external USB drives. Thanks.