Can I install OS X on an external hard drive?

Discussion in 'macOS' started by amirite, Jan 11, 2016.

  1. amirite macrumors 6502a

    Joined:
    Aug 17, 2009
    #1
    I'm running 10.11 and would like to install 10.10 on an external hard drive and boot from that.

    How possible is this?
     
  2. chrfr macrumors 603

    Joined:
    Jul 11, 2009
    #2
    If your computer can run 10.10, there's no problem doing this, but you will probably need to create a USB installer and boot from that because I don't believe the 10.10 installer will run in 10.11.
     

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