For those who want to install on eMMC, it only requires a 1gb SD card. I would suggest finding a old card and using it. That way you don't have to go through the process of reclaiming all the storage space on your larger/faster card. Besides, if you want to flash updates in the future, you will be better off keeping the older/slower/smaller card just for that purpose--that is, turn it into a dedicated update flashing card. Then when you get ready to flash a new update just copy it to the dedicated SD card and flash away.