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I've moved on from a previous job, and as part of the process I need to return my work provided phone.

I have factory reset the phone, as well as electing to erase the SD card. There was some sensitive data on the phone (pictures, documents etc) that I want to make sure are unavailable to whoever uses the phone next.

Can I be certain that this data cannot be recovered via an undelete application? Does the factory reset + erase sd write zeros to the drives or simply mark them as empty space?

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One more hint is Nuke My Phone:

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Works directly on the device.

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If the phone can be put into USB Mass Storage mode, then it's possible to recover deleted files (especially on SD cards) using recovery tools like Recuva.

You might also want to look at this question: Dban on android

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