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You've probably seen this message (maybe in a bit newer GUI but still the same).

I wonder if anyone know when it is triggered?

  • I wonder how this is too broad @bmike? It is a question of how many MBs left or maybe percentage of the disk which is definite. – iskra Sep 2 '16 at 11:39
  • I would say - either ask when? or what? or possible? - it looks like three questions at a minimum to me. Maybe delete the entire last paragraph if the main point is to know when. – bmike Sep 2 '16 at 13:28
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    Although I can't find anything to prove this, I recall from the OS X 10.6.8 Snow Leopard days that the trigger was reaching 2GB or less free on the startup volume. – da4 Sep 5 '16 at 16:18

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