It shows up for normal, external hard disk drives. Is there a way I can force it to encrypt?

The installed OS X is El Capitan.

  • I'm not sure why it doesn't offer before format [but it doesn't, you're right], however, you can encrypt it at any time afterwards - this answer gives a good explanation - apple.stackexchange.com/a/181105/85275 – Tetsujin Dec 24 '15 at 9:04
  • Thank-you. I turned your comment in to a simple answer below. – Reilly Beacom Dec 29 '15 at 5:53

You can't do it from Disk Utility but you can do it from Finder by right-clicking on the partition and choosing Encrypt.

  1. Open Disk Utility and click on the drive (not the partition)

  2. Click Erase button

  3. Choose Name

  4. Choose Format: OS X Extended (Journaled)

  5. Choose Scheme: GUID Partition Map

  6. Click Erase button

  7. When complete, open Finder

  8. Right-click on the new drive partition

  9. Select Encrypt

  10. Enter passwords

  11. Finish

  • The key step here is "click on the drive (not the partition)". (by the way, I did it from Disk Utility.) – Eugenio De Hoyos Sep 5 '16 at 2:49
  • 1
    For me, after step 10 I get "A partition, not a whole disk, is required for this operation." Could not find any way to create a partition -- the Partition button is greyed out. I also tried Erasing to select the encrypted format -- but that option does not appear – Jelle van Geuns May 13 '17 at 1:29

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