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I have partitioned a drive to create two logical partitions from one physical drive in the past, but the partitions were not resizable after I initially created them and it ended up being a nightmare to undo.

I have a new MacBook Pro that I'd like to set up two logical drives that can be resized. What is the correct way to go about doing this? I see articles online about it, but they discuss El Capitan and older OSes.

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Here is Apple's guide on the much better way of using containers to hold all the space on a drive and then make resizable and shares space logical volumes.

In practice this is so much better than the old way of having to guess beforehand how much space each needed and being forced to jump through hops to grow and shrink volumes. APFS does need SSD to run fast, but you gain so much flexibility to create new volumes it's worth selling an old Mac to get a new one IMO. I don't recommend this on Fusion Drives - there, try to void any split unless you can't get external SSD for a better APFS experience.

If you like hearing how this works, watch this video alerting at 12 minutes in on the benefits of space sharing...

As to how to add, back to the first link. I have never needed to reserve space or use quotas, but feel free to experiment if you feel it’s better to restrict things for your setup.

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  • Thank you for posting. I'll give this a try after backing everything up.
    – Adrian
    Sep 14, 2020 at 0:02

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