Digital forensics is a branch of science which deals with the recovery and investigation of materials found in digital devices. Forensics is usually mentioned in connection with crime, vaguely similar to criminal investigations on TV shows like CSI: Crime Scene Investigation and NCIS. However, several experiments (1, 2), including this one, use methods of digital forensics as proof that people do not pay attention to what happens with their personal data when replacing their digital devices (computers, hard drives, cell phones). In this blog post series we will reveal what we managed to dig out from supposedly erased devices. The sensitive information includes pictures (even very private ones!), videos, contacts, SMS messages, Facebook chat logs, Google searches, GPS location coordinates, and more.
more here.............https://blog.avast.com/2014/07/09/android-foreniscs-pt-2-how-we-recovered-erased-data/
more here.............https://blog.avast.com/2014/07/09/android-foreniscs-pt-2-how-we-recovered-erased-data/