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Mar 27, 2012 at 14:13 vote accept Hisham
Mar 23, 2012 at 22:36 comment added user9290 Windows works in a similar fashion. The hiberfil.sys file is analogous to the Mac OS sleep image file. It is also the same size in disk space as the amount of RAM. Windows provides a way to permanently disable it within the OS, although it's not widely known.
Mar 23, 2012 at 21:13 comment added Hisham Yes, I'm a 100% confident safe sleep is the cause. System puts all memory on disk in case of power loss. See this article: macworld.com/article/1053471/sleepmode.html on how to disable it if you want. I haven't decided yet, but might disable safe sleep to free up those precious 16gb!
Mar 23, 2012 at 21:03 history answered Hisham CC BY-SA 3.0