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→Overwritten data: traces
===Overwritten data===
===Overwritten data===
Wanted information sometimes gets overwritten after it is marked as deleted. Since the operating system sees it as free space, data will simply be written to that specific sector or group of sectors almost completely destroying the old information. This prevents simple disk surface searching from finding what is wanted, but some trace of it can still exist. This trace usually exists in the form of stronger or weaker than average magnetism on a [[Hard disk|hard disk drive]]. Such minute differences cannot be read by a conventional computer, but specialized equipment can be used to detect and interpret them.
===Malfunction===
===Malfunction===