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When formatting a USB drive on a Mac   

Step-by-step guide

  1. After inserting the drive, click the magnifying glass icon in the top right hand corner of the screen or press (Command + Space Bar) and type in "disk utility."  Double click the first result, or just hit Enter.

  2. Disk Utility will open and display all physically connected drives, including SD cards.  Find the one you want to clear in the menu on the left and click "Erase."

  3. Change the format to ExFat, then hit erase. If it gives you a message saying it was not cleared, eject the card or drive and check that the read/write lock is not engaged.  Reinsert the drive or card and try the process again.