offtheroad
Registered
I installed Yosemite on an internal hard drive upgraded from Mavericks and I have another internal HD with Snow Leopard because I have some old app's, When I booted back into Snow Leopard then tried to boot back into Yosemite the Startup area in system pref's won't show Yosemite hard drive. I also have a third internal HD with Mavericks on it and if I boot into it then I can see Yosemite HD in the possible HD's to boot into. Help, do I need to now completel do away with Snow Leopard?