Dual Boot with Snow Leopard and Mavericks not possible?
I have an Early 2011 Macbook Pro with 2,3 GHz i7 Quad and two 512 GB SSDs (the secondary disk in an optical drive bay enclosure). This Macbook Pro can run Snow Leopard and Mavericks on the primary disk without problems. I still need Snow Leopard to run some software not comaptible with Mavericks. When I try to set up a dual boot system however, problems appear and it looks like it is not possible. When I start from Snow Leopard, I cannot select Mavericks as a start volume and vice versa. The error message says something like "Bless tool" cannot use this disk, i.e. unmount and boot from it. The problem remains when I exchange the disks (putting the primary disk in the secondary drive enclosure and vice versa). When I put the secondary drive in an external case however, it is possible to boot from it - but strange things happen when the system starts: My computer clock is reset to 1/1/2001, WiFI passwords are not remembered for more than one session, disk permissions are reported as "repaired" but do apear as not repaired when I check them again - and other issues). I have verified both disks already and repaired permissions but that does not change the situation. So my experience is different from what is said in https://discussions.apple.com/thread/566781. It looks like the latest Mavericks cannot coexist with Snow Leopard on neiter a secondary internal drive nor on an external drive. This is strange since both disks and systems work flawless when run alone. Any suggestions to solve this problem?