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What Causes Data to be Lost?
This is a two part answer. There are logical & physical reasons for data corruption. Let's talk about the logical one first. An example of logical is when you press the delete key and did not mean to. Formatting a drive or a problem with scandisk/defragmentor occurs. A very common logical corruption is when a virus infects a hard drive. Physical corruptions is when moisture, air, or dust penetrates the hard drive chassis and creates bad sectors. Exposure to extreme temperatures/humidity. Power surges overloading the drive. Last but not least, just plan old mechanical failure. Both Logical and Physical failures can be devastating to the user. They both can cause loads of headaches and need for screaming your head off when you lost hours and hours of work, maybe days.
