Contribute
Register

Guide: Multibooting UEFI on Separate Drives

Joined
Feb 5, 2019
Messages
2
Motherboard
H61M-P20-G3
CPU
i5-2320
Graphics
HD 6670
Solved! Apparently when I unchecked Legacy in Clover Configurator GUI but it didn't write it to the config.plist. I checked and unchecked it and it wrote to the config.plist properly. All fixed now, what a pain and waste of time.
Need some help plz
 
Joined
Apr 7, 2019
Messages
5
Motherboard
P8H67-I
CPU
i7 2600
Graphics
RX580
Is there a significant benefit to using UEFI boot? I mean how many of us are using >2TB boot volumes?

I am still a fairly huge fan of "Legacy" boot because then you can boot directly off the MBR by simply aiming your BIOS to boot from that specific drive. Seems a lot safer than screwing around with various bootloaders only to have it nuked when you do an update? I had rEFInd installed on my MBP for enabling external thunderbolt eGPU in Windows but when I upgraded to Mojave, it was wiped out and the original OS X bootcamp bootloader was re-installed (this is on my 2018 MBP)
 

trs96

Moderator
Joined
Jul 31, 2012
Messages
13,839
Motherboard
GA-Z97X-UD3H-BK
CPU
i5-4690K
Graphics
HD4600 / RX 570
Mac
iMac, Mac mini
Mobile Phone
Android
Is there a significant benefit to using UEFI boot?
Yes, many more benefits than just having a >2TB volume.

For Hackintoshers booting Clover UEFI it opens up all the potential functions in Clover like UEFI hot patching.

In more general terms for PCs here are the main ones.

Benefits of UEFI boot mode over Legacy BIOS boot mode include:

1) Support for hard drive partitions larger than 2 Terabytes

2) Support for more than four partitions on a drive

3) Fast booting and efficient power and system management

4) Robust reliability and fault management
 
Joined
Nov 22, 2013
Messages
63
Motherboard
Gigabyte GA-Z87MX-3DH
CPU
i7-4770K
Graphics
Sapphire Nitro+ Radeon RX VEGA 56
Mac
MacBook Pro, Mac mini
Classic Mac
Power Mac
Mobile Phone
iOS
For Win10:
[...]Reboot to BIOS/UEFI and disable CSM. Save&exit, continue boot to desktop. Shut down, disconnect the drive.
Thanks for the guide. I have Mojave running fine on a Hackintosh. Until now, Mojave has been the only OS on the machine. I want to add Windows 10 on a separate drive. I have followed your guide. The last step in your Win10 instructions - disabling CSM - is where I first run into trouble: CSM support is set to "ALWAYS" and greyed out in the BIOS/UEFI-interface, so I can't change its setting. (?)

More importantly, when both drives (Mojave and Win10) are connected, the machine will only start up in Windows. Clover is never initiated. If I disconnect the Win10 drive, Clover and Mojave start up as usual.

Any suggestions?
 

Going Bald

Moderator
Joined
Aug 14, 2010
Messages
22,532
Motherboard
GA-X58A-UD7 Rev.1 BIOS F7
CPU
Intel Xeon W3670
Graphics
RX580
Mac
iMac, MacBook Pro, Mac mini
Classic Mac
iMac
Thanks for the guide. I have Mojave running fine on a Hackintosh. Until now, Mojave has been the only OS on the machine. I want to add Windows 10 on a separate drive. I have followed your guide. The last step in your Win10 instructions - disabling CSM - is where I first run into trouble: CSM support is set to "ALWAYS" and greyed out in the BIOS/UEFI-interface, so I can't change its setting. (?)

More importantly, when both drives (Mojave and Win10) are connected, the machine will only start up in Windows. Clover is never initiated. If I disconnect the Win10 drive, Clover and Mojave start up as usual.

Any suggestions?
With both drives connected boot to UEFI/BIOS. Set the Mac OS drive as first in BBS boot order. Save&exit, continue boot. It should boot to Clover and allow you to choose OS to boot.
 
Joined
Nov 22, 2013
Messages
63
Motherboard
Gigabyte GA-Z87MX-3DH
CPU
i7-4770K
Graphics
Sapphire Nitro+ Radeon RX VEGA 56
Mac
MacBook Pro, Mac mini
Classic Mac
Power Mac
Mobile Phone
iOS
With both drives connected boot to UEFI/BIOS. Set the Mac OS drive as first in BBS boot order. Save&exit, continue boot. It should boot to Clover and allow you to choose OS to boot.
Thank you very much! I didn't really find anything called "BBS boot order" in the UEFI/BIOS, but I did find some drive icons that seemed to be listed in a certain order. I tried dragging them around and found that I could change the order of them that way. This helped! Now the machine automatically runs Clover at startup - and I can see a couple of drives with a Windows icon in Clover.

However, when I choose the Windows drive that says EFI on it in Clover, Windows freezes at startup. If, however, I press F12 at startup and manually choose the correct Windows startup volume in the UEFI/BIOS (before Clover is initiated), Windows starts up just fine. Also, I notice that Clover is annoyingly slow at startup (reporting that it is checking hardware etc.). My son (it's my son's computer) says it been that way for a while (before we installed Windows) - slow, but maybe not THAT slow.

I am unsure of the correct etiquette here. Perhaps I should start a new thread about those problems?
 

Going Bald

Moderator
Joined
Aug 14, 2010
Messages
22,532
Motherboard
GA-X58A-UD7 Rev.1 BIOS F7
CPU
Intel Xeon W3670
Graphics
RX580
Mac
iMac, MacBook Pro, Mac mini
Classic Mac
iMac
Thank you very much! I didn't really find anything called "BBS boot order" in the UEFI/BIOS, but I did find some drive icons that seemed to be listed in a certain order. I tried dragging them around and found that I could change the order of them that way. This helped! Now the machine automatically runs Clover at startup - and I can see a couple of drives with a Windows icon in Clover.

However, when I choose the Windows drive that says EFI on it in Clover, Windows freezes at startup. If, however, I press F12 at startup and manually choose the correct Windows startup volume in the UEFI/BIOS (before Clover is initiated), Windows starts up just fine. Also, I notice that Clover is annoyingly slow at startup (reporting that it is checking hardware etc.). My son (it's my son's computer) says it been that way for a while (before we installed Windows) - slow, but maybe not THAT slow.

I am unsure of the correct etiquette here. Perhaps I should start a new thread about those problems?
The correct Win10 icon is labeled Boot Windows EFI from EFI.
 
Joined
Apr 1, 2019
Messages
87
Motherboard
Gigabyte Z390 Designare
CPU
i9-9900
Graphics
RX 580
Mac
iMac
So, Question (it's actually in the next para. - this is background): In order to create my Windows installer USB booter, I had to use Bootcamp in MacOS Mojave: I created a bootcamp Windows installation on my second (Windoze) SSD. When it was installed, from within that windows I created my PROPER Windows installer USB. Then, I formatted the main bootcamp windows permission but left the existing UEFI/EFFI (not sure what you call it). Everything seems fine. I think.

MY QUESTION IS.... is there any lingering screwy-ness from that bootcamp "efi" partition or whatever, and is that possibly affecting my Clover EFI installer -- maybe screwing up my windows somehow and not enabling certain hardware I'm not aware of, etc.? Everything seems pretty great ? I just want to make sure because.. .I have .. no idea.
 

Going Bald

Moderator
Joined
Aug 14, 2010
Messages
22,532
Motherboard
GA-X58A-UD7 Rev.1 BIOS F7
CPU
Intel Xeon W3670
Graphics
RX580
Mac
iMac, MacBook Pro, Mac mini
Classic Mac
iMac
MY QUESTION IS.... is there any lingering screwy-ness from that bootcamp "efi" partition or whatever, and is that possibly affecting my Clover EFI installer -- maybe screwing up my windows somehow and not enabling certain hardware I'm not aware of, etc.? Everything seems pretty great ? I just want to make sure because.. .I have .. no idea.
Should not be. The only difference when you installed using bootcamp is that is placed the UEFI partition at the beginning of the drive. Windows usually installs the UEFI either second or third position and Clover does not like it there. You should have no problems.
 
Top