It goes without saying that you should keep your sensitive data protected if you don’t want it to end up with a stranger. The Mediasonic HFR2-ASU3S2 Smart Shield HDD enclosure can help you accomplish that with encryption. It has hardware embedded 256-bit NIST certified AES encryption with smart key access.
This device supports 3.5″ SATA I / II / III hard disk drives and RAID 0 / 1 / 3 / 5 / 10 modes. Not super expensive for what you get.