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I am selling my old iPad 4, in which I stored some private data. I have done erasing my iPad data and settings, is it true that all my data is really gone and completely unrecoverable?

If not, what else should I do to make sure my data is unseen by the buyer?

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4

Data on an iOS device [3GS & later] is protected by hardware encryption.

Wiping the device using Apple's guide at What to do before selling or giving away your iPhone, iPad, or iPod touch is quite sufficient.

Extract :

  • If you paired an Apple Watch with your iPhone, unpair your Apple Watch.
  • Back up your iOS device.
  • Tap Settings > iCloud. Scroll down and tap Sign Out. In iOS 7 or earlier, tap Delete Account.
  • Tap Sign Out again, then tap Delete from My iPhone and enter your password.
  • Go back to Settings and tap General > Reset > Erase All Content and Settings. * If you turned on Find My iPhone, you might need to enter your Apple ID and password.
  • If asked for your device passcode or Restrictions passcode, enter it. Then tap Erase [device].
  • Contact your carrier for help transferring service to a new owner. If you aren't using a SIM card with your device, you can contact them to get help transferring service to the new owner.

See also : Apple KB - iOS: Understanding data protection
On recent iOS the setting is under Touch ID & Passcode.

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