Generally you never want to use JFFS2 or other flash file systems on a flash device that has a separate controller. this is because their own wear leveling wil

Generally you never want to use JFFS2 or other flash file systems on a flash device that has a separate controller. this is because their own wear leveling will usually confuse the hell out of the controller and can sometimes cause it to either slow down or to lower the life because the controller will not level things properly. Whether ext4 or not is better than say XFS for this, no clue though.