If you think that merely formatting a drive is enough to actually delete data, you may be in for a big surprise. There are plenty of free tools that can be used by anyone and that can unformat the drive and reconstruct the data. That's why when you give your coworker or friend a file or a program on a disk (floppy, ZIP, Jaz, or any other type of disk), or give him access to your hard disk, you may actually give him access to all the information.