![]() It may still mean you have to reboot to fix it if you can't easily quit the app, but at least you *know* which one it was and can troubleshoot further (or contact the developer). This will immediately tell you which one is the offender and doesn't require you to launch an app (though Activity Monitor will show you the same thing if you can launch it?). Your internal disk is usually the startup disk, but you can also start up your Mac from an external disk or a CD or DVD that has system software on it. This becomes quite difficult if you can't launch anything to help troubleshoot! Instead of MenuMeters I started using iStat Menus, and one difference is that iStat Menus has a little drop down from the Memory menu that shows you the top 5 memory-consuming apps. The startup disk contains the macOS system software. ![]() The trick, of course, is to figure out which app it was that did this. ![]() With the way OS X manages swap (as files on your boot drive), this can very quickly fill up your disk. When an app uses more memory than you have RAM, it starts pushing into "swap space," also called, "virtual memory" - that means it starts using your hard disk to store the data it can't physically keep in RAM. A memory leak refers to a situation when an application doesn't release RAM that it no longer needs, and instead just keeps asking for more. The NVRAM or Non-Volatile Random Access Memory stores information such as startup disk selection, sound/volume settings. Great troubleshooting, Sarah! This is almost certainly a memory leak in one application or another.
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