If you want to convert it to APFS, you must defuse it by uninstalling CoreStorage and turning the SSDs back into separate drives again. CoreStorage – if an SSD is part of a CoreStorage ‘fusion’ drive, even if the other drives are also SSDs, then it will be left in HFS+ and cannot be formatted as APFS.When High Sierra is installed on them from High Sierra, though, it will install onto APFS if so formatted, but does not automatically convert. External – not converted when High Sierra is installed on them from Sierra, no option, and installer will not install from Sierra onto APFS, only HFS+ Journaled.Can be converted from HFS+ Journaled to APFS, and formatted as APFS, using Disk Utility in High Sierra. Left unconverted if High Sierra installed on external drive. Internal – converted to APFS when High Sierra is installed on them, no option.Here’s a brief guide to the different file systems supported by the first release of High Sierra 10.13 on different types of disk.
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