A. Overwriting
Overwriting involves replacing existing data on a storage medium with a pattern of data, typically zeros, to prevent recovery of the original data. This process is often called "zeroing" because it frequently involves writing zeros over the data to ensure it is securely erased.
Not sure how it is Overwriting:
Overwriting: Writing random data over the actual data. The more times the
overwriting process occurs, the more thorough the destruction of the data is
considered to be.
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