Question: SSD does not show up in System Preferences?
Hi, I am using a Mac Pro mid 2010. The drive I am using now is system 10.10.5 (Yosemite) and working ok however, in system pref. under start up disk I do not see my SSD drive which is OS Sierra. The drive does show up on my computer but can't start with it? I use to. Any thoughts? Thank you!