Solution
Format Flash Drive Mac Fat32
Most External drives come preformatted with the Master Boot Record (MBR) partition scheme. If you are formatting your external drive to use as a recovery drive you will need to format to Mac OS X Extended (Journaled)
- Navigate to the Utilities folder by using the shortcut Command-Shift-U in the finder or type in “Disk Utility” via Spotlight.
- Plug your external drive into your Mac (you will then see it appear in both disk utility and your desktop)
- Select the external disc (do not select the volume entry which is below)
- Click the Erase tab
- In the format table please select Mac OS X Extended (Journaled) in the list of options
- Click on Erase and confirm that you wish to do this.
- Once the disk has successfully formatted it should know in the Partition Map Scheme that it is GUID Partition Table.
- To remove the disk click on the eject button and remove once it has fully ejected.
Format Flash Drive Windows 10
Mac OS Extended (Journaled) does not work natively with Windows. If you need to go between macOS and Windows then format your drive ExFAT on macOS IMPORTANT: Reformatting the drive will erase all data on the drive, so you should copy any data you want off the drive prior to formatting. Now, find the FAT32 partition and format it to OS X Extended (Journaled), which is the desired HFS+. Finally, click ' Apply ' button to make all changes performed. Tip: You may receive the prompt 'The volume 'MAC' is not journaled.