XBMCNut

If you want to be able to exclusively use an external USB drive without a Micro SD  Card in a Pi3 for Hass.io , these are the steps you’ll need to make it happen. Installed Raspbian1 Lite (2017-04-10) on a MicroSD card and followed the instructions here3 to enable USB boot mode. Rebooted Pi then shut down a few minutes later. Burned hassio2 Pi3 image to a 16GB USB drive. Booted PC into Gparted1 to re-partition hassio image. Increased /dev/sdb4 from 1GB to around 4GB (must do first otherwise you can’t expand the resin-data partition). Increased /dev/sdb6 from 1GB to pretty much whatever was left. With the modified thumb drive back in my PC, I added the following located in the resin-boot drive and also in the resin-rootA partition inside the resin-boot folder : I changed the “root” option in cmdline.txt to: root=/dev/sda2 and I added the usb boot line below to config.txt , right at the end: program_usb_boot_mode=1 I then put the reworked thumb drive back in my Pi3