i have partitioned my hard drive. 1 part is the el capitan partition and 1 part is the lion partition. i do not have a problem with installing and booting el capitan. i seem to not be able to install (and boot) lion. (fyi, i tried installing lion first, then el capitan. also tried installing el capitan, then lion, neither worked) imo, this should be technically possible. anybody have any experience or tried this? thanks.