Writing image to SD card

These are the steps to write an raspberry pi OS image to an SD card on MacOS

1. Insert card on reader

Identify the disk number

diskutil list

2. Unmount the disk

unmountDisk /dev/disk2

3. Write the image

sudo dd bs=1m if=hassos_rpi3-2.12.img of=/dev/rdisk2 conv=sync

4. Eject card

sudo diskutil eject /dev/rdisk2

Done!

https://www.raspberrypi.org/documentation/installation/installing-images/mac.md