High Quality Content by WIKIPEDIA articles! The Disk Masher System (.dms) was an often used method on Amiga, to create a compressed image of a disk (usually floppy). The disk is read block-by-block, and thus its data structure is maintained. DMS won approval particularly in the demo scene and the Warez scene, since with this tool, disk images could generally be transferred easily with telecommunication modems to mailbox networks like FidoNet for efficient distribution.