MP 1,1-5,1 Can i dual boot Mojave and Monterey from the same SSD with OC on CMP 5,1

[DIY Monkey]

Hi all.

I have a CMP 5,1 currently running native Mojave (bay 1) / Windows 11 Pro x64(UEFi seperate SSD bay 2(installed via Martins Lo’s OC),
Both OS are booting from Martin Lo’s OC ver 1.0.1 on the Mojave SSD’s EFI partition

What i would like to do is partition the Mojave drive and install Monterey to the second partition of the Mojave SSD,
and still be able to boot Mojave - Monterey and windows via Martins OC boot picker

will this work if i do the Monterey install via the OC boot picker?
or will it only give me the choose of just one MacOS at boot picker?

Edit:
I wanted to test tiny11 out for gaming purposes,
so i tried doing the same thing with windows 11 and tiny11 on the windows SSD
using windows installer in Mojave, and i could only boot the tiny11 install via OC boot picker
after installing tiny11 because they were both on the same drive in seperate partitions,
when it installed tiny11 it over wrote the original windows 11 boot.efi with the tiny11 boot.efi
and i lost access to the original windows 11 install.

ended up having to reformat windows SSD and reinstall Win 11 from scratch,
this time Via OC boot picker to fix the problem, I no longer have tiny11 installed,
gave up on that idea because i do not have room for another drive in the case.

all bays are used:
Bay 1= 500 GIG SSD - Mojave and OC
EFI Partition contains the following folders:
EFI/
BOOT
OC
Apple
Windows
Bay 2= 1TB SSD - Windows 11(NO EFI Partition, booting from Bay 1 EFI)
Bay 3= 1TB SSD - Games install drive
Bay 4= 2TB HDD - Storage/Backup drive (APP installer files and BackUp's)

 

[reader50]

It works perfectly well with OCLP. I'd expect it to work with OC also.

 

[DIY Monkey]

It works perfectly well with OCLP. I'd expect it to work with OC also.

so i will get both macos at OC boot picker? even if they are on the same SSD?

 

[reader50]

That's how it works with OCLP. All bootable macOS installs, along with Windows (if installed) along with Linux (if installed).

I've had a problem with the Linux install presently going invisible, where the boot picker doesn't see it any more. But all the others appear like clockwork.

Most older macOS versions will not boot through OCLP, you have to direct-boot them by holding Option, and booting them without OCLP. But they still appear in the OCLP boot picker.

Here are my test results, of which macOS versions will boot through OCLP on my 4,1 -> 5,1:

Snow Leopard (yes)
Lion (no)
Mountain Lion (no)
Mavericks (no)
Yosemite (hangs halfway through boot)
El Capitan (no)
Sierra (no)
High Sierra (yes)
Mojave (yes)
Catalina (yes)
Big Sur (yes)
Monterey (yes)
Ventura (yes)
Sonoma (yes)
Sequoia (yes)

 

[DIY Monkey]

That's how it works with OCLP. All bootable macOS installs, along with Windows (if installed) along with Linux (if installed).

I've had a problem with the Linux install presently going invisible, where the boot picker doesn't see it any more. But all the others appear like clockwork.

Most older macOS versions will not boot through OCLP, you have to direct-boot them by holding Option, and booting them without OCLP. But they still appear in the OCLP boot picker.

Here are my test results, of which macOS versions will boot through OCLP on my 4,1 -> 5,1:

Snow Leopard (yes)
Lion (no)
Mountain Lion (no)
Mavericks (no)
Yosemite (hangs halfway through boot)
El Capitan (no)
Sierra (no)
High Sierra (yes)
Mojave (yes)
Catalina (yes)
Big Sur (yes)
Monterey (yes)
Ventura (yes)
Sonoma (yes)
Sequoia (yes)

ok so in short even if Mojave and Monterey are on the same SSD in seperate partitions it will show both in the boot picker.