Formatting a USB Drive to GUID
When I try to erase and format a USB drive from the MBR to GUID I can not find a way to do that. The partition button is grayed out and I feel stuck.
iMac 27" 5K, macOS 10.14
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To format a drive using Disk Utility first be sure you see the entire drive. In Disk Utility menu bar the last icon on the left "View" set to "All Devices". Then choose your entire drive (Uppermost, unindented icon). Format Mac OS (Extended) GUID Partition Disk. Erase.