Tom's Hardware on MSN

HamsterOS jams a 32-bit GUI operating system in a 1.44 MB single floppy for 386-era hardware

HamsterOS fits on just a single 1.44 MB floppy disk, and it's set for a full release this November.
BBC

Computers - Edexcel Operating systems

A computer cannot function without an operating system unless it is an embedded system. An operating system is a collection or ...