Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Data erasure is a method of software-based overwriting that completely destroys all electronic data residing on a hard disk drive or other digital media. Permanent data erasure goes beyond basic file deletion commands, which only remove direct pointers to data disk sectors and make data recovery possible with common software tools. Unlike degaussing and physical destruction, which render the disk unusable, data erasure removes all information while leaving the disk operable, preserving assets and the environment. Software-based overwriting uses a software application to write patterns of meaningless data onto each of a hard drive's sectors. There are key differentiators between data erasure and other overwriting methods, which can leave data intact and raise the risk of data breach or spill, identity theft and failure to achieve regulatory compliance

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