Formatting SD card

Insert the SD card in the reader. Then launch Disk Utility. Which you'll find in Launchpad -> Other.

First select the SD Card on the left pane. Then select Erase. I have to translate it since I'm using the Dutch MacOS.

After clicking on the Erase button. You'll get a little menu. Here you can give the card a new name (named mine Antarctica). And from a drop down menu you can choose in which format you wish to format it. I went with ExFat since that one can also be read and written to in Windows and Linux. Next to MacOS.

Good luck.

Hello,

Please refer to the following Apple Support document.

How to erase a disk for Mac