知乎，让每一次点击都充满意义 —�?欢迎来到知乎，发现问题背后的世界。あいうえお表（ひらがな表）：シンプル文字のみ（やゆよ・わをん版）ピンクEspecially, hard drives retain information soon after formatting which can be seen to the electronic forensics team and flash media (USB sticks, memory cards and SSD drives) retain info even after a safe erasure. I