Craig Federighi confirms Apple File System coming to Fusion Drives in future macOS High Sierra update

“The initial version of macOS High Sierra released [yesterday] morning limits the new Apple File System (APFS) to Macs that have all-flash built-in storage, excluding iMacs and Mac mini machines that feature Fusion Drives,” Juli Clover reports for MacRumors.

“Apple software engineering chief Craig Federighi has confirmed APFS will indeed be coming to Fusion Drives in a later update,” Clover reports. “Federighi shared the info in an email sent to MacRumors reader Michiel, who asked if APFS would be added later.”

“The first macOS High Sierra beta released in June did include support for Fusion Drives and converted iMacs and Mac minis to APFS,” Clover reports, “but support was removed in subsequent betas and was not reimplemented, presumably due to stability problems and bugs with the feature.”

Read more in the full article here.

MacDailyNews Take: macOS High Sierra 10.13.3.

10.13.1 will be a quick bug clean up. 10.13.2 will correct more hidden issues. And, 10.13.3 will deliver APFS to Fusion Drives.

We’ll that’s our prediction, at least. We’ll certainly take it sooner, if it’s ready, just as we’ll settle for 10.13.4, if need be.

Preparing your Fusion Drive Mac for the macOS High Sierra install – September 18, 2017


  1. If I would have known this issue when I purchased my new iMac, I probably would have gone with Flash storage as opposed to the Fusion drive. But I will have to be patient. The whole thing about APFS is that it is supposed to really make Fusion drives run better. One of the reasons why I decided to go with that option.

    1. Patience is a good idea anyway I think. This is a big change, and it’s not nearly as straightforward as the controlled environment in iOS. Usually I am fairly quick to upgrade, but not this time.

  2. Will APFS ever be available for regular spinning rust drives? If so, would it give any advantage over HFS+? What about RAID volumes?

    How about clarifying that, Craig? Lots of us still use spinning rust. Heck, I’ve got 40TB+ attached to my Mac and I’d appreciate some sort of info.


    1. A bit of an elitist attitude, trondude? SSDs are still a bit pricy and fall short of the storage offered by larger HDDs. I put a USD$100 2TB HDD in my old iMac years ago. SSD was not a viable option and, even today, it would cost a whole lot more for the same 2TB.

      Fusion drives were a logical solution during the transition period from HDDs to SSDs, which is still in progress. Fusion drives combine the storage of HDDs with some of the speed of SSDs using a smaller, lower cost SSD module. I would not call that “effectively obsolete,” especially if Apple’s latest file system will soon support Fusion drives.

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