Yosemite on startup SSD, Mavericks on HD?

Discussion in 'OS X Yosemite (10.10)' started by wmmfcr, Jan 13, 2015.

  1. wmmfcr macrumors newbie

    Nov 6, 2014
    Hello, all,

    I have an early 2009 Mac Mini and a couple of years ago I replaced the optical drive with a small SSD to use as the startup drive, leaving the original HD for media files, libraries, etc. They work great together, without quite being a homemade Fusion Drive.

    Tonight I was looking at the Startup Drive option under System Preferences and realised that when I upgraded to Yosemite last year, it only upgraded the SSD, leaving the HD still listed as running Mavericks. I don't perceive any problems in daily use, but I just wondered if it was preferable to have both running the same OS, and if so, how to do that.

    I ask here because I can't seem to find the right Google terms to get an answer. Thanks in advance for your help.
  2. simonsi macrumors 601


    Jan 3, 2014
    What is on the HDD is only relevant if you want to be able to boot from it.

    I have a backup bootable Yosemite partition on my Media HDD but primarily boot from Yosemite on my SSD. When I upgrade the SSD OS then that gives an easy regression path if anything doesn't work well enough.

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