iOverwrite simply writes a large number of random-data files into the flash memory of your iPhone, iPad or iPod Touch, which overwrites any recently deleted data. This way, if your iOS device comes into the possession of someone who can perform an un-deletion of files (like a hacker or a government), your privacy is that much safer than if you had only erased your data.
iOverwrite also estimates the write speed and read speed and reports them, thereby serving as a useful benchmark of the flash memory performance.
NOTE! If iOverwrite is unable to overwrite 100% of the free space on your iOS device's flash drive, this may indicate defective TLC flash chips in your device.
• Now reporting the flash memory write speed.
• Now estimating the flash memory read speed.
• Now pauses periodically to discourage iOS from killing the app.
• Now creates larger randomized files to overcome a problem regarding iOS devices that have huge amounts of storage.