Sources:
http://www.htpcguides.com/move-linux-banana-pi-sata-setup/
https://forum.htpcguides.com/Thread-Problem-pointing-boot-to-hdd
https://blog.doenselmann.com/banana-pi-mit-ssd-hdd-betreiben/

sudo su
 
lsblk
 
fdisk /dev/sda
# show partitions on drive by pressing p
# delete old partitions by pressing d (attention! data loss!)
# write changes to partition table by pressing w
 
fdisk /dev/sda
# create new partition by pressing n
# type primary p
# partition number 1
# default first and last sector (use whole disk)
 
#format drive as ext4
mke2fs -t ext4 -L rootfs /dev/sda1
 
#copy root fs from sd card to the harddrive
sudo mkdir /tmp/sata
mount /dev/sda1 /tmp/sata
rsync -arx --progress / /tmp/sata