In this Labrats video tutorial the instructors Andy Walker and Seab Carruthers show how to undelete the deleted files and recover them. When you save data to your computer, the computer stores the data in the binary format on the hard disk. To keep track of the files, the Operating System maintains a file table that shows the location of the data on the hard disk for a specific file. There are many file formats like FAT, NTFS etc. So when you are erasing the file only the entry in the file table is deleted and the corresponding original file still stays some where on the hard disk, provided it was not overwritten by new data. So there are lots of tools available that locates these deleted files and recover then as shown in this video. This video shows how to recover the deleted files from your hard disk.