As these units reach their end of life and Apple is incapable of providing a decent model with which to replace them, I think WE OUGHT TO BE ABLE TO SHARE LINKS TO THE SERVICE MANUALS WITHOUT BEING HOGTIED BY STUPID FORUM POLICY.
To clarify the new generation of mac pro is decent enough for some things but an external thunderbolt chassis is no surrogate for four internal sata bays. I could rant about the stupid cloud but it would do no good.