How to encrypt a USB, when I get the message "(GPT) GUID Partition Table partitioning scheme is required? '."

I just tried to encrypt a USB drive with my Mac book (latest version) and got the message "A GUID Partition Table (GPT) partitioning schΘma required." What does this mean and suggestions on how to proceed?

The drive must be formatted for Mac. Start in the Recvery mode. Erase the drive using disk utility (select the top icon which represents the entire disk and click clear. Partition scheme must be Mac OS (Extended) first partition GUID, which is the default value.

If you want to install a system on it follow these steps:

How to reinstall OS X on your Mac - Apple Support

Tags: Mac OS & System Software

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