hi all,
I have a late 2009 macbook with latest high sierra on it.
I replaced the bootable SATA hdd with a 500GB SATA disk as it failed.
I decided to add a secondary hdd, a Plextor SATA SSD, model PX-128m6Pro firmware 1.02, dated 2014.
on the DVD bay !
I installed osx high sierra latest as well...