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  1. tillytoon

    Loss of MacOS during system boot

    Thanks for replying! I had tried disconnecting the Windows SSD and booting Catalina. Unfortunately the no entry sign appeared again. I followed your suggestion of using my UniBeast USB stick to boot the system. It made it to the macOS Utilities page where the options are 'restore from time...
  2. tillytoon

    Loss of MacOS during system boot

    Hi, the hard drive that I had installed MacOS Catalina on seems to have been erased during the boot up and I'm wondering what I can do. I have been running Catalina running without issues for months and had just installed a wifi adapter (Fenvi FV-T919) and another SSD with Windows10 installed...
  3. tillytoon

    Installing a MacOS (Catalina) after running Windows 10

    The images in my last post of the boot options in the BIOS were taken while both M.2 slots were occupied. I thought that the M2M slot wasn't showing up as a boot option because there is no OS installed on that drive, but maybe it's because there's a SATA port(s) being used by another device...
  4. tillytoon

    Installing a MacOS (Catalina) after running Windows 10

    That's helpful to know. I got the impression that the presence of Win10 would prevent MacOS installation, but it's a relief to hear that's not the case. When I installed Win10 I didn't know that it should be in the first slot the BIOS looks at, but it was installed on the M2A drive, which must...
  5. tillytoon

    Installing a MacOS (Catalina) after running Windows 10

    Hi, I've been running into problems installing a MacOS on my system after running Windows 10 first. My build was done for the purpose of running a MacOS, but I also purchased Windows 10 with the intention of making a dual boot system with two M.2 drives (one for each OS). Windows 10 was...
  6. tillytoon

    UEFI or Legacy?

    Hi, I'm having some trouble deciding between UEFI or Legacy for my GIGABYTE Z390 AORUS ELITE mobo. I'm wondering if it's UEFI capable, since the installation guide says to use UEFI for all capable systems. The guide also says to use Legacy for all BIOS based systems, which mine is. I'm also...
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