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What works on macOS 10.13 High Sierra? What problems exist?

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.

  • Direct access to the boot disk is no longer possible (at least, unless you disable System Integrity Protection, which we don’t recommend). This means both iDefrag and iPartition are unable to inspect the boot disk or any volume on the boot disk.
  • iDefrag’s reboot-and-defragment mode cannot function (again, unless you disable System Integrity Protection, which we don’t recommend).
  • Neither iDefrag nor iPartition support APFS. You cannot defragment an APFS volume, nor can iPartition safely resize it. Currently, iPartition displays the partition type of APFS volumes as 7C3457EF-0000-11AA-AA11-00306543ECAC, as it doesn’t know that GUID.

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.

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