dd

Automated Image & Restore (AIR) is an open source application that provides a GUI front end to the dd/dcfldd (Dataset Definition (dd)) command. AIR is designed to easily create forensic disk/partition images. It supports MD5/SHAx hashes, SCSI tape drives, imaging over a TCP/IP network, splitting images, and detailed session logging.

Interesting article on how-to create additional swap space on your server after partition table has been written. The author had to expand swap and create a mountable /tmp partition on live production server. The how-to uses dd to create a "file" then mounts that file for swap and /tmp.