Beagle Bone Black

Headless control via USB

Using Terminal on a Mac to open a remote shell

ssh root@

There is no password

Use df -h to determine the the name of the SD card device on your system. In my case disk2

Now unmount the SD card

sudo diskutil unmount /dev/disk2s1

You can also use Disk Utility to unmount the disk

sudo dd bs=1m if=/Users/bthomsen/Documents/BeagleBone/bone-debian-8.2-tester-2gb-armhf-2015-11-12-2gb.img of=/dev/disk1