The process of permanently erasing information from storage media. Since ordinary file deletion or logical formatting leaves data potentially recoverable, dedicated software is used to overwrite the entire hard disk with meaningless data, making recovery impossible. It is an important security measure to perform before discarding, returning, or reselling a PC or storage device.

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• 2015h27a #99Aさんが用いる専用ソフトがもつ機能として，適切なものはどれか。