Can I create a area on a Catalina APFS disk for Majove only booting?

[blackxacto]

I want to reinstal a Mojave system for booting and playing 32 bit games on a what used to be called a "partition", but which is now container in APFS.

Is that possible? I have a Mojave DMG install app. I just cant remember how to get the system on a container.

 

[IowaLynn]

Still want a partition. Assume you have enough space

Or install to another drive, SSD is preferable.

 

[blackxacto]

Thank you. Yes ill have room

 

[Jack Neill]

Still want a partition. Assume you have enough space

Or install to another drive, SSD is preferable.

Why just use a container in APFS?
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I want to reinstal a Mojave system for booting and playing 32 bit games on a what used to be called a "partition", but which is now container in APFS.

Is that possible? I have a Mojave DMG install app. I just cant remember how to get the system on a container.

Make a new container and install Mojave to it, just select startup disk from system prefs or ALT after the chime, if your mac still chimes.

 

[Spacetime Anomaly]

I did this a few days ago. You'll need the latest Mojave installer (they expire over time), and a thumb drive to boot from (Catalina will not let you run the Mojave installer otherwise). Oh, and backup everything first!

Here's some links that I found useful:

Latest Mojave installer on the App Store

Apple's instructions on how to create an APFS volume

Apple's instructions on how to make a bootable thumb drive for the Mojave installer

OSX Daily's instructions on the process

(The last link describes how to install a Catalina beta on a Mojave machine, but the process is similar)

Good luck.

 

[IowaLynn]

Apple uses terms loosely. Muddies the waters. From link Apple APFS:

Apple File System (APFS) allocates disk space on demand.

"When a single APFS container (partition) has multiple volumes, the container’s free space is shared and can be allocated to any of the individual volumes as needed."

Partitions are now dynamic virtual entities - fluid.

But systems? And is the startup disk working properly for both?

So APFS is rock solid, flawless and can be trusted. I'd trust physical partition for now, one I can erase easily and clone separately. For which I rely on CCC
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If your Mac has T2 chip

System Integrity Protection prohibits modifications to the current startup disk's Preboot helper partition.

If you add an APFS volume to your current startup disk's APFS container, the macOS bless facility will be unable to update the container's Preboot volume to include support files for the second partition. Multiple, bootable volumes within a single APFS container is a supported configuration, but you can only make the second volume bootable if you boot from some other startup disk for the duration of the cloning procedure. Likewise, you will be unable to change the startup disk selection to the second volume while booted from the first volume.

https://bombich.com/kb/ccc5/help-my-clone-wont-boot

 

[blackxacto]

I thought that was what we know use rather than partition a disk, now ive been corrected. Thank you

 

[blackxacto]

I did this a few days ago. You'll need the latest Mojave installer (they expire over time), and a thumb drive to boot from (Catalina will not let you run the Mojave installer otherwise). Oh, and backup everything first!

Here's some links that I found useful:

Latest Mojave installer on the App Store

Apple's instructions on how to create an APFS volume

Apple's instructions on how to make a bootable thumb drive for the Mojave installer

OSX Daily's instructions on the process

(The last link describes how to install a Catalina beta on a Mojave machine, but the process is similar)

Good luck.

Dude, you gave me the jackpot. All i needed was a couple of the links of yours, and BAM I'm running Mojave on an unused 128gb ssd from the fusion drive originally installed in my 17,1 iMac. Thank you so much.

 

[Spacetime Anomaly]

Well

Dude, you gave me the jackpot. All i needed was a couple of the links of yours, and BAM I'm running Mojave on an unused 128gb ssd from the fusion drive originally installed in my 17,1 iMac. Thank you so much.

No problem. Glad I could help.