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Guide: Multibooting UEFI on Separate Drives

Hi, thanks for the info.

My system is already running Ubuntu 16.04 and Windows 10 and now I want to add OSX to the bunch. You stated that you had to installed Ubuntu after OSX. Is there a possibility to keep my installations and just add OSX to the existing installations or do I have to reinstall Ubuntu? Also, when I boot my current system, I actually get the Ubuntu OS loader, where Ubuntu is the default system and only if I scroll down to the Windows Boot manager it actually boots into Windows. Do you think it would be possible to add OSX to the Ubuntu Boot loader at all or do I have to start from scratch?
Separate or same drive?
If separate drive, install Mac OS on a new, blank drive. Install boot loader of choice (OC recommended if using Mojave, Catalina or Big Sur). Configure config.sys to scan for Windows and Linux. Boot to BIOS/UEFI and make the Mac drive first in BBS boot order. You should be able to select Mac OS, Win10 or Linux to boot them.
 
Separate or same drive?
If separate drive, install Mac OS on a new, blank drive. Install boot loader of choice (OC recommended if using Mojave, Catalina or Big Sur). Configure config.sys to scan for Windows and Linux. Boot to BIOS/UEFI and make the Mac drive first in BBS boot order. You should be able to select Mac OS, Win10 or Linux to boot them.
Thanks!

I have a separate SSD intended purely for OSX, so I follow your guide. Until I found out that my GPU is not supported by Mojave and newer OSs I was trying to configure OC, but since my GPU (nVidia M5000) won't ever be compatible with the new systems, I might as well use Clover and make life easier.

However, if I were to buy an AMD GPU that's compatible with all the recent OSs (Mojave, Catalina and Big Sur), could I install that in my workstation (next to my existing GPU) and hard-wire it to only be used with OSX? The goal would be to have two GPUs, but only use one at any given time, i.e. nVidia for Linux & Windows, and AMD for MacOS.
 
However, if I were to buy an AMD GPU that's compatible with all the recent OSs (Mojave, Catalina and Big Sur), could I install that in my workstation (next to my existing GPU) and hard-wire it to only be used with OSX? The goal would be to have two GPUs, but only use one at any given time, i.e. nVidia for Linux & Windows, and AMD for MacOS.
I have heard of people doing this but never tried it myself. If you are going to purchase another GPU, best to get an AMD GPU that will perform as well as or better than the nVidia quadro card you now have and swap the new for the old. OTOH, there are still nVidia GPUs that are supported - see Dortania listing. You might be able to find one that will be comparable to the M5000, but it is doubtful as Mac support for nVidia GPUs has always been several years out of date, never having the latest GPU by a version or two, e.g. support for K5000, but not for M5000. The M5000 will outperform the K5000 by a good deal.
 
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I have heard of people doing this but never tried it myself. If you are going to purchase another GPU, best to get an AMD GPU that will perform as well as or better than the nVidia quadro card you now have and swap the new for the old. OTOH, there are still nVidia GPUs that are supported - see Dortania listing. You might be able to find one that will be comparable to the M5000, but it is doubtful as Mac support for nVidia GPUs has always been several years out of date, never having the latest GPU by a version or two, e.g. support for K5000, but not for M5000. The M5000 will outperform the K5000 by a good deal.
Thanks.

One last question. My current Mac is running Catalina and I would like to restore my time-machine backup onto the new Hackintosh. However, since it'll be running High-Sierra I have doubts that it'll be able to restore the Catalina backup. Any suggestions or ideas?

FYI the main purpose of the Hackintosh is so that I can run Logic Pro X, because my current mac is simply too old, laggy, and doesn't support my big Logic sessions like it used to anymore. This is evident from the sessions crashing due to "system overload". I certainly hope that all the third-party plugins will be working on the Hackintosh.
 
Thanks.

One last question. My current Mac is running Catalina and I would like to restore my time-machine backup onto the new Hackintosh. However, since it'll be running High-Sierra I have doubts that it'll be able to restore the Catalina backup. Any suggestions or ideas?

FYI the main purpose of the Hackintosh is so that I can run Logic Pro X, because my current mac is simply too old, laggy, and doesn't support my big Logic sessions like it used to anymore. This is evident from the sessions crashing due to "system overload". I certainly hope that all the third-party plugins will be working on the Hackintosh.
As you probably found out, the closest Mac to your hardware is the Late 2013 Mac Pro and Catalina does not support this Mac as it was dropped from support with Mojave. High Sierra runs well on it and Mojave can be made to run with the no_compat_check boot arg.
If your main app is LPX, you do not really need a powerful GPU unless you also game on it and the M5000 is not a very good gaming GPU. Suggest an inexpensive RX570 or RX580.

Best to install High Sierra from scratch if that is the Mac OS version you will be running.
 
I apologize in advance as this question has likely been answered already. I want to be able to launch both Windows 10 and OS X Mojave (10.14.6) from this computer. I've had Mojave running without issue for some time, launching from Clover at startup etc. I recently added a new hard drive and followed the steps outlined at the beginning of this thread for making a Windows 10 drive. I see a Windows 10 drive in the Clover launch window but it takes me to a blinking cursor on a black screen and then nothing. I can launch Windows 10 by selecting F12 at startup and selecting the drive in the menu thereafter.

When I say I followed the instructions at the beginning of the article I mean that I followed them for Windows installation. I did nothing to my OS X driver thereafter.

If this question has been answered previously (I've tried to find an answer but 5 years is a lot of posts to sort through) and someone can point me there I'm happy to try to follow whatever instructions have been previously offered.

Many thanks.
 
Do you have an EFI partition on the Win10 drive? Did you disconnect the Mac OS drive while installing Win10?
Does the icon in Clover have the Win10 drive labeled as Boot Windows EFI from EFI? If not, what is the label on the Win10 icon?
 
Thank you very much for your prompt reply.
Do you have an EFI partition on the Win10 drive?
Yes there is an EFI partition on the Win10 drive. I just mounted it from OS X using Clover Configurator and verified that it has an EFI directory in which are two directories, Boot & Microsoft.
Did you disconnect the Mac OS drive while installing Win10?
I did. I disconnected all other drives while I was installing Win10 as per the recommendation at the beginning of this tutorial.
Does the icon in Clover have the Win10 drive labeled as Boot Windows EFI from EFI? If not, what is the label on the Win10 icon?
The icon in Clover has the Win10 drive labeled as "Boot Microsoft EFI Boot from EFI."

Again, thank you for your help with this. I will try to answer any further questions promptly.
 
Thank you very much for your prompt reply.

Yes there is an EFI partition on the Win10 drive. I just mounted it from OS X using Clover Configurator and verified that it has an EFI directory in which are two directories, Boot & Microsoft.

I did. I disconnected all other drives while I was installing Win10 as per the recommendation at the beginning of this tutorial.

The icon in Clover has the Win10 drive labeled as "Boot Microsoft EFI Boot from EFI."

Again, thank you for your help with this. I will try to answer any further questions promptly.
Have you disabled CSM in BIOS/UEFI?
 
CSM was not disabled in BIOS. It was locked on "Always" but after I switched whatever the OS switch just above it was from "Other OS" to "Windows 8" it became accessible and I switched it over to Disabled. I then switched the OS switch back over to "Other OS". The menu that asks whether I want to be able to boot "UEFI Only/UEFI and Legacy/Legacy Only" had been set at "UEFI Only" when I made these changes. Now that CSM is disabled that menu is no longer accessible and it's locked on "UEFI Only." No idea whether this is important or not.

When I look at the Boot order on the first screen of the BiOS I noted that none of the icons that represented the Windows drive had the little UEFI icon above them as some of the others did. But I thought I had installed Windows 10 as UEFI. Could I be easily mistaken on that point?

After making the changes I've made above I rebooted the machine and tried to boot into Windows 10 from Clover. First I got the little wheel of spinning balls and soon "Preparing Automatic Repair" appeared, then "Diagnosing Your PC" and finally the screen that says "Your computer didn't start properly" and the options to restart or to try to fix the thing. So I restarted and when I got to Clover tried again to boot Windows 10. This time no messages, just the spinning balls wheel and then a black screen and the power light on my monitor blinking as it does when it's not getting any content.
 
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