This article provides some analogies, and I found some hints on how APFS allows easier resizing of partitions.ĭoes the software directly convert one file system to another on the fly? If APFS is basically an enhancement to HFS+ I can see this being easy, but my impression is that is not the case.ĭoes it create two partitions and slowly move content from one to the other, resizing as it goes, or create an image of the old system then restore it to the new system? It seems these would require a fair amount of free space, and could fail if the drive is full. I've done some searches but have only found references to the fact that it can be done. My question is, how, technically, is this accomplished? I'm not asking how a user can do the conversion, I'm asking what actually happens on the disk during the conversion process. This can happen automatically during an OS upgrade or can be done by the user with Disk Utility. Since High Sierra, Apple has allowed users to do an in-place conversion of an existing HFS+ file systems to APFS without losing files.
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