A security measure that writes meaningless data (such as all zeros, all ones, or random values) over the entire hard disk multiple times, making the original data unrecoverable. It is considered one of the most reliable methods for preventing information leakage before transferring, returning, or disposing of a PC or storage device. Unlike logical formatting or emptying the recycle bin, it makes physical data recovery extremely difficult.

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• 2010h22h #72PC やハードディスクを譲渡したり返却したりする前に実施しておくこととして，ハードディスクからの情報漏えいを防ぐ最も確実な方法はどれか。