How to format a drive for use with an Apple system and IzzyStor
macOS 10.14 Mojave
Plug in the flash or external drive to the Mac
Launch "Disk Utility" which can be found in /Applications/Utilities/Disk Utility.app
In the top left corner of Disk Utility, click the menu button and choose "Show All Devices"
Now that you can see the device, and not just the volumes, we will format the device. Select the device, and click "Erase" in the top menu bar.
In the window that appears, choose the following options
Name: (any name you want)
Format: Mac OS Extended (Journaled)
Scheme: GUID Partition MapClick "Erase"
Your drive is now correctly formatted for use with an Apple system and compatible with utilities such as IzzyStor