Install Yosemite on external HHD and boot from whatever Mac you like

Discussion in 'OS X Yosemite (10.10)' started by fanta, Aug 27, 2014.

  1. fanta macrumors regular

    Jun 2, 2011
    I would love to try Yosemite PB2 on a retina MacbookPro but i dont know of anybody who has one. Would it be possible to install the PB 2 on my machine (macbook air 2014) on an external harddrive and then boot from it on another machine by just plugging in the HDD?
  2. 0000111 macrumors member


    Jul 24, 2014
    Seeing as booting from a USB stick should work, yes, and HDD should work as well. You'd have to do some research about the special boot mode (usually as simple has holding a key down during startup). Though, it might be difficult since the OS would have to install...

    In other news, I personally had PB2 on a rMBP and it worked just fine!
  3. notrack macrumors 6502

    Feb 19, 2012
    That's what I have done. Installed it on an external usb spinning hard drive. Installation and boot up takes longer than on an internal drive (especially when you have the pcie ssd rMBP). To boot up the external drive, select it in the system preferences and cllick Restart.
  4. bmac89 macrumors 65816


    Aug 3, 2014
    That is what I have done. It was easy to do but takes longer to install & boot etc. I use the external drive to test Yosemite on my Imac and Macbook.

    I believe the external drive needs to be formatted as mac os journaled using disk utility. Also I think the drive/partition needs to be set to Guide (also in disk utility). Doing this will wipe anything already on the external drive. When installing Yosemite you then need to make sure you choose the external drive and not accidentally install it on main hard drive like someone appears to have done on this forum. Always best to have a backup though.

    To boot from the external drive hold down the alt/option key when booting computer and chose the yosemite drive. If this does not work go to System Preferences > Startup Disk > (select yosemite drive & click restart).

    Google also has a few instruction on how to do all this if need be.
  5. fanta thread starter macrumors regular

    Jun 2, 2011

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