Upon completion, the system will automatically restart. Close Disk UtilityWhen the installer asks you where to install, choose Catalina For Name: type MacintoshHD (You can rename it later) e. Highlight your target drive for the Mojave installation in the left column. c. In the top menu bar choose Utilities and open Disk Utility b.

For a new installation of macOS, you MUST erase and format the destination drive according to the following steps before continuing.

(If you have issues reaching the installer, you can use the spacebar on the boot screen to enter alternate boot modes such as verbose and safe mode.)

At Clover boot screen, choose Boot Install macOS Catalina from myVolume.

Step 8: Press the hotkey to choose boot device (F12 Key for Gigabyte MoBo)

Thanks in advance for your help & advice.Step 7: Insert the Thumb Drive to the Hack you wanted to Triboot on. But they'll have a shared NVRAM, no? Will that be a problem? (Also, I read a comment somewhere suggesting that Catalina APFS and Monterey APFS might not be compatible because.

Am I doing something which is possible, or am I'm missing something major? I need two separate EFIs on two different disks. My question (thank you for your patience). I'm fine with debugging the OpenCore install process myself, but I'm starting to think that I might be doing something ill-advised. But that just booted into Recovery, listing all the drives in my machine except for the new drive on which I want to install Monterey. I've added the drive, and booted from the Monterey installer on an OpenCore-prepared USB. Boot from the Monterey drive & Monterey! Boot from the Catalina drive & Catalina! Other drives in the machine will be shared between the two. That drive will have its own OpenCore EFI, because the requirements of Catalina & Monterey are different. Add a drive to my H'tosh & install Monterey 12.6.2 on it. I don't want to delete my fine-but-dated Catalina install until I'm sure a clean Monterey install is working fine. But software is starting to require MacOS 11 or later. My H'tosh is great: a i9-10900K, 64GB RAM, RX580, yada yada, running OpenCore + Catalina 10.15.7, rock solid. Having a problem actually doing it, but have raised a separate post about that. EDIT: Changed to solved as it appears possible to do what I'm trying to do: thanks to everyone who replied.

Dual boot hackintosh catalina