DMS (Disk Masher System) is a compressed disk image format used primarily on Amiga computers to store and distribute floppy disk contents. Developed as an alternative to raw ADF images, it employs compression algorithms to significantly reduce file sizes while preserving the exact bit-level structure of original disks, including custom boot blocks and non-standard tracks. DMS files were widely popular in the Amiga software preservation and demo scene throughout the 1990s, as they could be unpacked back to physical disks or converted to ADF format using tools like DMSread.