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Partioning a Mac OS Extended (Journaled) drive for use to test Mojave. Can I use my Fusion drive (Mac OS Extended (Journaled) to create another partition on which to test Mac OS 10.14 (Mojave)?
iMac Line (2012 and Later)
You should be abled to use Disk Utility to do that. You can boot into the Recovery Partition, use Disk Utility/Partition to partition the drive, and then reboot normally. Download Mojave and when the installer runs, select the new partition as the install disk.
Thanks for this Eric. Does the fact that my main partition would be Mac OS Extended (Journaled) and the one for Mac OS 10.14 (Mojave) (presumably) would have to be the new Apple File System? On one physical disk?
Many thanks HWTech and Eric
I'm now a little confused! I'm on Sierra (10.12.6) at the moment and contemplating the move to Mojave. Eric, I seem to remember something like that too, but did that change in Mojave to use fusion drives and convert them to APFS? Creating a partition seems even more of an issue than simply upgrading my whole machine right now. My iMac is from 2017, I'm on Sierra and all seems OK, but then I read about possible problems. What should I do? I think Mojave has been around long enough that any major problems have been ironed out - upgrade now?
@Eric Root, I forgot about Mojave not converting the Fusion Drive. No matter what Mojave will be fine with HFS+.
@Wild Mull, Mojave is a change from Sierra. I personally have not enjoyed the removal of features and other changes in the last several versions of macOS. I would suggest downloading the Mojave installer now while you can before Catalina is released so Mojave will appear under your "purchased" items. I personally wouldn't upgrade to Catalina until at least a month or two after release so any issues are patched.
A better option might be to get an external Thunderbolt3 or USB3 drive to test Mojave so you don't risk your main drive. There is always a risk resizing a partition and Mojave does manage the CoreStorage differently.
Hi Eric & HWTech
Many thanks to you both. I certainly want to act before Catalonia is released because I have one critical piece of software that won't run under the new 64bit regime. The software people are working on it but I fear it will be 2020 before they release.
For now I'll download Mojave and go from there. An external SSD I have (Time Machine backup), I'll have to get another!
Many thanks again.
You are welcome. After the download, when the installer opens, quit it before it starts installing.
You are welcome. I don't think it matters as long as they are 2 separate partitions, but I haven't actually tested that.
Hi Eric, thanks again. I started the routine to make a new partition, but APFS is not an option. Will 10.14 run in Mac OS Extended (Journaled)?
The Mojave installer will convert the file system to APFS during the install.
You are welcome. As far as I know it will. If I remember correctly, in Mojave, fusion drives didn't get converted to APFS. That was used for SSDs.
Now I need to know how to 'download' Mojave, rather than upgrade!
Going to the App Store only wants to upgrade my machine - as far as I can tell ...
Any help gratefully received.
Partioning a Mac OS Extended (Journaled) drive for use to test Mojave
