“Copy on write” is the magic behind the snapshot feature in APFS and also allows you to copy really large files in in only a couple of seconds. Why? Well, to understand why APFS and HDDs are not well suited, I first need to explain one of the key features of APFS: “copy on write”. After 16 months of using and testing APFS- Apple’s new file system-I’ve come to the conclusion that you probably don’t want to use it on HDDs (disks with rotating platters).
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