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When iDefrag restarts my machine, it just starts up again normally.

If you are trying to use reboot-and-defragment mode, and you find that iDefrag restarts the machine back to your normal desktop (as opposed to a special mode where you see iDefrag on a grey background and no other programs running, not even Finder), there are three possible causes:

  1. You are running the wrong version of iDefrag for your operating system. If you need to downgrade recent versions, you may want to clear out the CoriolisSnapshot.kext and CoriolisOnlineHelper.kext kernel extensions from /Library/Extensions.

  2. Your machine is not configured to boot from the correct disk. This means that it will let the firmware choose a disk to boot from, but if that disk isn’t the one iDefrag expects, iDefrag will have configured a different disk to boot into iDefrag, and that won’t work. The confusing thing here is that System Preferences will usually just show the current boot disk as the selected one in this case — so it might look like things are set up properly! Anyway, the fix is simple: go to System Preferences choose “Startup Disk”, then click on the correct startup disk even if it is already selected.

  3. You had version 5.1.3 installed on a machine and have updated to 5.1.5; in addition, you’re running macOS Sierra. In these circumstances, it’s possible for an out of date KEXT to be in /Library/Extensions, and that can cause problems. Please try updating to 5.1.6 or above in that case.

If neither of these fixes work, get in touch and we’ll try to provide assistance.

Posted by alastair at 2016-Dec-19 10:12:22 UTC. Last updated 2017-Jan-11 11:01:36 UTC.