mac midiguy
Level 1 (65 points)
Mac OS X

Q: Restart to another drive

I have Snow Leopard ( the minimum OS ) installed on an external USB drive.  My main hard drive is an a late 21.5 model  2009 iMac running Maverick ( OS 10.9.5).  Then on a external USB I have Yosemite 10.10.5.

 

When I want to restart from Snow Leopard to Yosemite for some strange reason the Yosemite drive does not show up but Mavericks drive does show.   Then to get to Yosemite i have to restart from Snow Leopard to Mavericks and then restart to Yosemite.  

 

Any ideas how to resolve this most annoying glitch ?

Posted on Sep 26, 2016 1:21 PM

by Niel,Solvedanswer
Niel Niel
Level 10 (313,488 points)
Mac OS X
A:

Yosemite introduced Core Storage; volumes which use it won't appear in the Startup Disk pane of System Preferences on 10.6.8 or earlier. Restart with the Option key held down to get to Yosemite directly.

 

(144940)

Posted on Sep 26, 2016 2:51 PM

Close
mac midiguy

Q: Restart to another drive

  • All replies
  • Helpful answers

  • by Niel,Solvedanswer

    Niel Niel Sep 26, 2016 2:51 PM in response to mac midiguy
    Level 10 (313,488 points)
    Mac OS X
    Sep 26, 2016 2:51 PM in response to mac midiguy

    Yosemite introduced Core Storage; volumes which use it won't appear in the Startup Disk pane of System Preferences on 10.6.8 or earlier. Restart with the Option key held down to get to Yosemite directly.

     

    (144940)

  • by mac midiguy,

    mac midiguy mac midiguy Sep 26, 2016 8:07 PM in response to Niel
    Level 1 (65 points)
    Mac OS X
    Sep 26, 2016 8:07 PM in response to Niel

    Many thanks to you Niel for taking the time to read my question/problem and for providing me with a straight up answer.   I am some what embarrassed for not knowing the solution.  However, at the same time i was really not aware or fully understood that Yosemite introduced Core Storage.  Will still have to research what Core Storage means. Thanks again.