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Initial High Sierra Release Won’t Support APFS for Fusion Drives

If you converted a Fusion Drive to APFS during the macOS 10.13 High Sierra beta, we have some bad news: the initial release version of High Sierra that Apple plans to ship on 25 September 2017 will not officially support it. This unexpected announcement presumably comes due to problems discovered during the beta that the company hasn’t yet addressed. Apple recommends that you back up the Fusion Drive, reformat it using Mac OS Extended (HFS+), and restore it from backup. The support document implies that Apple will support APFS-formatted Fusion Drives in a later release of High Sierra.

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