III. Mac: please format it as "MS-DOS FAT", by: 1. Use spotlight to search for "disk utility". 2. There are 2 removable drives added. Choose the drive for the microSD card with capacity 59 / 63 / 128GB (it is GB). DO NOT CHOOSE THE DRIVE WITH 67M. 3. Choose Erase. 4. Choose "MS-DOS FAT" in the Format. 5. Press "Erase" at the lower right corner. 6. Then press "Erase" in the new pop up windows. 7. Wait for a while, it is done. Do not touch anything at this moment and make sure the power supply and cable connection is stable.