Deep Scan Recovery utilizes cutting-edge technology to scan your entire device for lost images, videos and audio files. It’s able to that by analyzing the following locations on the device:
Hidden Folders A hidden file is any file with the hidden attribute turned on. Just as you’d expect, a file or folder with this attribute toggled on is invisible while browsing through folders — you can’t see any of them without explicitly allowing all of them to be seen. They are not a security mechanism because access is not restricted – usually the intent is simply to not “clutter” the display of the contents of a directory listing with files the user did not directly create. (source: Lifewire)
Cache Folders As you use applications, they start storing files to reference later. These files are stored in an app “cache.” For instance: When you’re using a web browser, it’ll save images you’ve seen so that they don’t have to be downloaded every single time the app needs them. This cache saves you time and data (source: Android Police)
Deep Scan Recovery analyzes the files contents and checks for lost images, videos or audio files.