MacFileVault

Turn On FileVault

Encrypt the drive by going to System Preferences > Security & Privacy to turn on FileVault. Click "Turn On FileVault..." under the FileVault tab:

Step 1

Select "Create a recover key and do not use my iCloud account" and then click "Continue"

Step 2

The recovery key will be shown on the next page. Write it down in a permanent location and then click Continue.

Step 3

The encryption process will take some time:

Step 4