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Some users might want to know what will work, and what will not work, with current versions of our software on macOS 10.13 High Sierra, so here’s what we know right now. This information applies to both iDefrag and iPartition.
None of these are things that we can fix, in the first two cases because the cause is the tightening of System Integrity Protection, and in the latter case because Apple has not published a technical specification for APFS.
In order to use iDefrag or iPartition on your boot disk, you will need to make a boot disk.
Posted by alastair at 2017-Sep-28 08:09:00 UTC.