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Message: <blockquote data-quote="MacInWin" data-source="post: 1948098" data-attributes="member: 396914">Apple has taken a totally different approach in APFS with the dynamic sizing of Volumes in Containers. Unfortunately, APFS can make a rotating drive perform horribly if there are a lot of changes to the files on the drives. But on SSDs it's brilliant.Not that it makes it better, but the challenge to what you want to do is that to move partition boundaries dynamically would mean that all of the data would have to be held somewhere in suspense as the drive parameters are changed, a very difficult, if not impossible, task. What you are having to do is basically what any dynamic repartitioning would have to do, i.e., put the data in a safe place, move boundaries and then put it back. To do that dynamically the biggest single challenge is where to put it. I really don't blame Apple for dodging that particular bullet...</blockquote>