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I used "kextstat | grep -v" to find active extensions, and found the following listed extensions.

  119    3 0xffffff7f826c7000 0x3e000    0x3e000    org.virtualbox.kext.VBoxDrv (3.2.4) <7 5 4 3 1>
  121    0 0xffffff7f8196c000 0x8000     0x8000     org.virtualbox.kext.VBoxUSB (3.2.4) <119 35 28 7 5 4 3 1>

I want to unload them with kextunload in order to reduce kernel memory usage, but there are not any org.virtualbox.kext.* files present in my /System/Library/Extensions/ directory. Any suggestions on how I can find where these are being stored and unload them?

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up vote 1 down vote accepted

VirtualBox puts their kexts into /Library/Extensions just as they should be. No third party should put anything into /System… if it's not absolutely necessary to do so.

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Aha! Thanks. (Duh!) I checked /Users/me/Library but not /Library. Found 'em. – currently angry Dec 6 '12 at 22:32

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