When I tried to format a SD card to APFS, the newer MacOS disk format, using the disk utility, I received the following error:
A GUID Partition Table (GPT) partitioning scheme is required.
Apparently, the default format (ExFAT) on the SD Card does not have a partition, and it requires a command line to fix it.
Open the terminal, and type:
diskutil partitionDisk disk6 GPT APFSX SDDRIVE 0
disk6 with the actual disk id, and
SDDRIVE is the name you use for your drive.
This will create the proper partition.
This is the available file systems. Type
diskutil listFilesystems to view it on your terminal:
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