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High Sierra's APFS optimized for flash storage & SSD, incompatible with legacy HDDs and possibly Fusion Drives | AppleInsider
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Solution approach: fixing APFS disk issue “fsroot tree invalid” in macOS High Sierra Public Beta 4 (17A315i) – Swiss Mac User
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How to format SSDs to APFS on Mac if “This drive does not use the GUID Partition Table (GPT) scheme” - JuicyAppleNews
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