@lelebrr Hi
One HD to boot the OS + one HD for roms support OK
2 HDs to stock roms : impossible.

Edit your fstab file for the UUID of your HDD partition.  I prefer UUID as it doesn't tend to change by moving drives around.  You can edit the fstab file and change the mount point of the /dev/whatever to UUID=uuid of your partition  /share (partition type without parentheses<span style="line-height: 1.5;">) (options without parentheses)</span> That fixes any problems I've had with things moving around or mounting in the wrong place.