I have decided to replace my nexus 5 because it has developed dead pixels. But i have my personal data like videos, photos and other sensitive information on the device. After doing some research I've realized that its very easy to recover data even after Factory Resetting the N5 or formatting in recovery with help of Disk Digger and other similar sorta apps.
So my question is how will i be able to prevent the recovery of my data if Google employee decides to recover it ? [Because on phone the customer care executive told me my phone will go through a thorough inspection]
I don't want my data to be recovered.
Please suggest me a surefire way to prevent the recovery of my data on nexus device.
PS: Nexus is rooted and running on Android L dev preview