What’s the difference between found files and reconstructed files? Disk Drill has a folder of each. After a deep scan, the Found Files folder is a bit smaller than the total used space on the drive, but is close. It also has the correct file names, extensions, and some semblance of a directory structure. Reconstructed Files has them grouped by type and named file0001.mp4, etc. It’s also way more space than the original (dead) drive was using.
Found files are those that the file system still recognizes and can recover most probably intact and with the original properties and meta-data. Reconstructed files would be those that were recovered using Disk Drill’s binary algorithms, and do not contain any meta info with them hence no file names. More details here: /help/can-i-recover-a-specific-file-with-disk-drill/