APFS for Mac Fusion drives is coming ‘very soon’

Craig Federighi, Apple’s senior vice president of Software Engineering said in an email exchange with a MacRumors reader that APFS for Mac Fusion drives is coming “very soon.”

Apple File System (APFS) is the default file system in macOS High Sierra for Mac computers with all-flash storage. According to Apple, it features strong encryption, space sharing, snapshots, fast directory sizing, and improved file system fundamentals.

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However, so far, it can’t be implemented on traditional hard drives or Fusion Drives (which is what my iMac has). The Fusion Drive is Apple’s name for its implementation of a hybrid drive. It combines a hard disk drive with a NAND flash storage (a solid-state drive of 24GB or more) and presents it as a single Core Storage managed logical volume with the space of both drives combined.