![]() WIth any new Mac, you cannot run an older OS X version that has not been originally installed. There are NO "special" drives that are bootable. It is a function of the disk setup process and the boot code that is in the OS software installation process. Same goes for SSDs and high speed read/write USB flash drives. Thank you again for your post! Kind regards, A. In the past I would always backup my Macbook (with 10.6.8) on a partition of my old iMac, where I always had the latest OS on one partition (and a CCC clone of my Macbook as backup on a second partition, preserving 10.6.8). ![]() ![]() Can you be so kind though to advise, which external hard drives you are using for that purpose, respectively which ones you recommend/worked best for you? Apparently there are a lot of hard drives out there from which you cannot start-up/boot.Īnd unfortunately there seems to be no way to run 10.6.8 on a partition of a brand new 3TB fusion drive iMac with El Capitan, which I also have. Thank you so much for pointing out this alternative solution, which I plan to try out.
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