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Not sure which version you are using? Click here to determine your version of macOS.Select GUID Partition Table before partitioning.IMPORTANT: This article applies to the following macOS version: (Select the disk name, not the volume name indented beneath it.) Click the Partition tab, select your partition, then click the Options button. If you're using OS X Yosemite or earlier, select your external storage device in Disk Utility.(Select the disk name, not the volume name indented beneath it.) Then click Erase and choose the GUID partition map scheme and any Mac OS Extended format before erasing. If you're using OS X El Capitan or later, select your external storage device in Disk Utility.This deletes all of the data stored on your device. If your storage device isn't using a GUID partition map, you can follow these steps to create one with Disk Utility.

Make sure that the Partition Map Type shown for your storage device is GPT (GUID Partition Table):

Select Storage from the sidebar, then select your storage device from the list of volumes.

Or hold down the Option key and choose Apple menu > System Information.

Choose Apple menu () > About This Mac, then click the System Report button.

Connect your external storage device to your Mac.

And to function as a startup disk, it needs to be using a GUID partition map. Make sure that your storage device is properly formattedįor best results, your external hard drive, thumb drive, SDHC or SDXC card, or other storage device should be formatted as Mac OS Extended, not FAT, ExFAT, or NTFS.

The "Make sure that your storage device is properly formatted" section of the How to set up and use an external Mac startup disk article provides the following instructions on setting up GPT: From your post, I understand that you are trying to set up a GPT (GUID Partition Table) with your flash drive. Thanks for using the Apple Support Communities.