You would think when you do a "factory reset" and agree to erase everything on your Android device that all of your data would be wiped out for good. But you'd be wrong.
As many researchers have discovered, data can be recovered with the right tools even after a factory reset has been performed. That's because when you delete something, the file itself isn't actually overwritten - the system just throws away all the info on the file, essentially tossing it in with whatever free space you have. Recoverable data can be a real privacy problem if you ever plan on selling or donate your Android phone. Read more...
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