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| OrangePi can boot from SD card or NAND but not from HDD.  Booting from NAND takes a bit of work.  Booting from SD card and running from HDD is easy - you just need to copy the root file system (generally /dev/mmcblk0p2) to /dev/sda1 and then change uEnv.txt in the boot partition (/dev/mmcblk0p1) so "root=/dev/sda1".  You will probably need to change /etc/fstab also if it references /dev/mmcblk0p2.  Then the OrangePi will run from SD card until it loads uImage then it will run from HDD. 
 Cheers,
 Steven
 
 
 
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