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May 15, 2015 5:40 PM in response to kickboxing42930by Skydiver119,It should be fine. Now if the FBI gets their hands on it and want to take it apart and hack their way in they might be able to accomplish it. But your average 'whee I got a new iPad' user won't be able to.
If you're concerned, do the erase all content and settings, set it up again and fill it up with something worthless, like movies or something, then erase all content and settings again and your personal data is not only removed but written over which makes it very, very hard for anyone to retrieve.
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May 15, 2015 5:40 PM in response to kickboxing42930by Michael Black,See Apple's document - iOS: Understanding 'Erase All Content and Settings' - Apple Support
Since the iPads support hardware encryption of data, the erase all content actually erases (over writes) the encryption key. The data remains actually, encrypted by very strong AES encryption, and without any decryption key to be used (or recovered) it cannot be decrypted. It will then get over written with use of the device. The advantage is that the process is much quicker than overwriting the entire solid state storage space.