This happens when you don't shut down properly, during an outage or when power surges. Always shut down properly. Simply pulling the plug on your computer leaves files floating in cyberspace, rendering some data unsaved or unusable. Overheating also causes system crashes. For home users without temperature-control systems normally used in banks and places like the Pentagon, make sure you keep your PC in a cool, ventilated area.
Business trips pose even greater dangers, so such as the trunk of a car.
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