Boot Multiple OC Bootloader from one USB/HDD for testing purposes

[STLVNUB]

Just a rough guide as the Title says, for testing different versions of OC or config.plist

 

I use a 1GB USB key for this tutorial but will work for Any Size USB or HDD

 

First off, decide how many versions you want, I did 3

 

Use Diskutilty to erase USB as GUID as Untitled Mac extended, but you can name it to your liking,Mine was OC1

Next, selected Untitled and Partition it all in one go

e.g hit plus and adjust it to required size and select MS FAT and change name to your liking,Mine was OC2

You now have 2 partitions

next split partition 2 and select MS FAT again, and change name to your liking, Mine was OC3 

you should now have 3 partitions all MS FAT

Hit Apply, it take make your 3 MS FAT partitions

So you now have 3 MS FAT partitions ready for next step.

 

Next copy your 3 efi folders to each partition, One EFI in each.

Boot and hold your boot menu key, in my case F11

 

You should be able to select and boot from any of the 3 versions

IF YOU DON"T GET THIS IN MENU YOU WILL HAVE TO USE THE BCFG COMMAND IN UEFI SHELL TO ADD EACH EFI/BOOT/BOOT.X64 AND NAME IT ACCORDINGLY
 

 

 

Edited July 23, 2020 by STLVNUB

[iCanaro]

single disk multi-efi systems use over 1 year
4 EFI on the Z370
3 EFI in T-RyZo

you can also use OC and Clover at the same time in a single EFI

 

Edited July 23, 2020 by iCanaro

[STLVNUB]

My next big trick is to put all OS X/Mac OS on a 128GB USB for my MacBook Pro.

Also will have a single boot loader to boot all of them for Hackinitosh

 

[STLVNUB]

I Installed Catalina on the MacBook Pro and its faster than High Sierra, everything works makes you wonder why it doesn't natively support. it

Apple being their usually greedy {censored}s I'd say

10GB ram at the moment, but will make that 16GB

Fusion HDD too replace with 500GB SSD

z

Edited July 26, 2020 by STLVNUB

[STLVNUB]

Big Sur runs on the MacBook Pro without any hacks. Wifi and sound not working