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According to https://support.apple.com/kb/HT201262 a safe boot will perform the following:

  • Verifies your startup disk, and attempts to repair directory issues if needed
  • Loads only required kernel extensions
  • Prevents Startup Items and Login Items from opening automatically
  • Disables user-installed fonts
  • Deletes font caches, Kernel cache and other system cache files

Apple as usual is somewhat vague. Does anyone have a list of the exact cache files deleted and where to find them?

Why I need this: I have two labs of iMacs where after a week or so of student use, they will freeze and when rebooted get stuck at 100% of the progress bar. About 80% of the time a safe boot fixes them (the remaining I usually end up wiping). I've looked at /Library/Caches and /System/Library/Caches before and after a safe boot and there appears to be no change.

Any clues what cache files I should look at next? If I can pinpoint the culprit, I can design a manual purge of this file and hopefully keep my uptime of these machines beyond a week.

  • Forgot to include, all machines are currently running 10.11.6 – Fyrefly Oct 14 '16 at 18:23
  • I seem to have found a resolution to my specific problem, but I'd like to keep this question open as it seems beneficial if someone could answer it. – Fyrefly Oct 24 '16 at 17:39

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