Description
现在二手手机非常多，在卖二手手机的时候，我们习惯把手机数据清空，再恢复出厂设置，很多人会以为这样操作下来，手机里的数据就没了，不会泄露个人隐私。其实，手机恢复出厂设置只是把系统文件还原、用户数据删除，在手机内部存储芯片上的内容并未彻底删除，这相当于将被删除数据所在区域的存储空间“标记”成了可以覆盖，但原来的数据还在那里。如有数据写入这部分区域，原始的数据才会被覆盖。因此，要保障旧手机出售时的信息安全，在手机恢复出厂设置并重启后，需要多次拷贝视频、下载软件，把原有手机存储空间占满，覆盖掉原有数据，最后再恢复出厂设置。
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