My disk utility has no encryption option.

I'm trying to format a USB key that I can encrypt.  But my disk utility does not have the drop down option for encryption. Can I have a utility obsolete? OS X El Capitan 10.11.5

In the Finder, when you attempt to encrypt, I get an error message saying "A Partition GUID (GPT) partitioning schΘma Table is necessary".

Suggestions please.

You must format the disk with a Table of Partition GUID.

You can do if you erase the drive with disk utility. Choose Mac OS extended (journaled, Encrypted) format.

If you encrypt the drive without deleting the content, it's impossible because it is already formatted with a Table of Partition GUID.

Tags: Mac OS & System Software

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