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  • artem
    Participant
    #1415851

    Hello all,

    I’m looking to try an Open Core Catalina install and had a few questions before I go in.

    Can I run a regular Mojave install on one drive and an Open Core Catalina on another and switch back and forth?

    I’d like to put the Open Core Catalina on an SSD and run it from one of the bays?

    I currently have a Sonnet M.2 card in my 12Core MP5,1.  One 2TB blade is my current Mojave and the other 3 are zero raided into a single 6TB audio work drive.

    Will an Open Core drive in the system conflict with this NVME PCIe card in any way?  Would I need to remove it?

    Will the Open Core process change my MP5,1 or my Saphire RX580 in any permanent way?

    Is removing Open Core from my Mac as easy as removing the Open Core drive and booting from my regular Mojave install on the NVME?  Or does it bleed beyond the drive it’s installed on?

    Thanks.

    The short answer to your question is – yes, I believe you can switch back and forth. The way to do that would be to have an OEM installation of your Mojave in the first place:

    1. Then you would clone your first drive to the second one and remove it from the bay (just so you can be certain that your experiment doesn’t go south if you get confused in the process and mess with the original drive. It should serve as your rescue)
    2. I would then install OpenCore on your second drive following the standard process and install Catalina

    Will an Open Core drive in the system conflict with this NVME PCIe card in any way?  Would I need to remove it?

    Hard to know without trying. The method in 1-2 should give you enough confidence for experimentation since you can always fall back easily.

    Will the Open Core process change my MP5,1 or my Saphire RX580 in any permanent way?

    Absolutely not, lol. Open Core is a boot loader and it has nothing to do with your firmware ROM.

    Is removing Open Core from my Mac as easy as removing the Open Core drive and booting from my regular Mojave install on the NVME?  Or does it bleed beyond the drive it’s installed on?

    Yes, pretty much. It certainly doesn’t bleed, because it lives on your hard drive. Unless you believe that it’s like COVID, then yes, I would be worried. Jokes aside, you are absolutely safe.

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