When formatting a USB drive on a Mac
- 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.
- 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."
- 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.