Can I install OS X on an external hard drive?

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

  1. amirite macrumors 6502a

    Aug 17, 2009
    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 604

    Jul 11, 2009
    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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