Force Mac Pro to boot with external SSD drive?

Discussion in 'Mac Pro' started by Webster J. Duck, Sep 10, 2016.

  1. Webster J. Duck macrumors newbie

    Jun 27, 2012
    Hello all,

    I’ve updated my Mac Pro 3,1 early 2008 (2 x 2.8 GHz Quad-Core Intel Xeon) with a Samsung 500 GB solid state SATA drive. I did a clean install of 10.11.6 on the new drive (Snow leopard then 10.11.6 skipping all the OS versions in between). I connected the drive internally with a Velocity Solo PCIe card. I used Apples migration assistant to move all the files from the original boot drive over.

    It will boot if I manually select it by pressing option at start-up, but I can’t get it to be the default boot drive using System Preferences --> Startup Disk. Any ideas on how to force this as the default start-up drive.

    Alternatively, can I prevent a drive from mounting on start-up? If I do this through the terminal, can it be reversed if I need to boot into the original drive? e.g. “sudo nano /etc/fstab” ---> UUID=XXXXX none hfs rw,no auto

    Many thanks,

  2. redheeler macrumors 604


    Oct 17, 2014
    Hold down the Control key when you press Return to boot from it at the boot menu, that'll set it as the default boot drive.
  3. Webster J. Duck thread starter macrumors newbie

    Jun 27, 2012
    Thanks. Not sure I understand. In system preferences> startup disk, hit control when I click restart? When I start with option pressed to get the SSD as the boot drive as soon as I click it, the computer boots. If I press control the system does nothing. Sorry if I'm being dense.
  4. frou macrumors 6502


    Mar 14, 2009
    Never knew about that. Nice tip!

    Use the arrow keys and the return key to interact with the grey screen, rather than the mouse.
  5. Webster J. Duck thread starter macrumors newbie

    Jun 27, 2012
    Thanks for the clarification. Unfortunately, it still doesn't work. The PCI SSD drive shows up as an external drive and just won't set itself as a default. I can live with it, but if my wife restarts the computer we'll have new data on the backup drive.
  6. Synchro3 macrumors 68000


    Jan 12, 2014
    Did you unlock this button?

  7. Webster J. Duck thread starter macrumors newbie

    Jun 27, 2012
    Synchro, thanks for the suggestion. I did unlock the preferences prior to changing

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