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換手機，平板電腦的其中一個問題就是要清除舊機內裡的資料。 蘋果的用家可以很放心，原來蘋果一早做了準備，所有的資料一早在寫入時用內置的密匙加密，只要一更新密匙，所有的資料也沒法重組或取回。 要清除的方法很簡單，就是從［設定］＞［一般］＞［重置］＞［清除所有內容和設定] 。這樣就會清除密匙來達到全部清除的目的，所以很快就會完成。 想蘋果也是利用了這方法來做到遙距清除資料。 Reference: http://support.apple.com/kb/ht2110 但對於安卓的用家，由於這個功能並不是內置，所以清理舊機就要多花一點功夫。

Easy to use file recovery tools for windows. Freeware for undelete / unerase files in hard disk / usb drive. You can also use this to check file which secure deleted. Can be download from http://www.recuva.com/

DBAN is a freeware that can completely erase the hard disk and prevent it from data recovery. It is very useful if you want to disposal hard disk with secure information. The file downloaded is a bootable CDRom ISO image. In order to use it, just burn the CD image and boot with the CD. It runs with Linux kernel, but it is contain an user-friendly GUI for normal user. Just try and you will know how to use. URL: http://dban.sourceforge.net/