I have a piDrive on a rPI3:
https://www.kickstarter.com/projects/2073955313/pidrive-low-power-msata-ssd-for-the-raspberry-pi

and have followed the steps at:
http://www.mictronics.de/2016/03/install-and-run-an-existing-image-from-pidrive/3/

To try and make the retropie image boot directly from the hard drive, but the resizing script just ran forever (4hours until I killed it)

After rebooting I see the retropie boot screen, but after that I’m thrown to a prompt.

df shows the following:

Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/root        2371536 2284240         0 100% /
devtmpfs          372268       0    372268   0% /dev
tmpfs             376588       0    376588   0% /dev/shm
tmpfs             376588    5296    371292   2% /run
tmpfs               5120       4      5116   1% /run/lock
tmpfs             376588       0    376588   0% /sys/fs/cgroup
/dev/mmcblk0p1    129776   21046    108730  17% /boot
/dev/sda1          58234   19952     38282  35% /media/usb1

I’m hoping someone may be able to help me figure out how to get this working?