On Nov 29, 2019, at 4:18 PM, Michael <[email protected]> wrote:
>
>> If you have room on your main disk and it is APFS-formatted, you can easily
>> create a new volume in Disk Utility that will share the free space, and if
>> it doesn't work out, you can delete the volume later.
>
> I'd like to know how to get two volumes to share free space if they are on
> the same physical disk.
>
> Heck, even with 10.9-10.12's logical volume groups, the same question.
>
> If this is something new in the "We'll force your root disk to be
> repartitioned because we're now making root read only" system, then it's a
> "don't care, thanks anyways" issue.
It’s related to the latter point, but it’s not limited to only the boot volume
being read-only. The boot volume being read-only is a Catalina change, but free
space sharing was introduced with APFS in High Sierra.
To simplify, APFS uses containers, and multiple volumes within a single
container will share the same free space. There’s been a bunch written about
this, but a decent overview can be found here:
https://blog.macsales.com/44596-partition-drives-create-apfs-containers-for-space-sharing-with-disk-utility/
<https://blog.macsales.com/44596-partition-drives-create-apfs-containers-for-space-sharing-with-disk-utility/>
Matt_______________________________________________
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