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FDOS may refer to:

  • Floppy Disk Operating System, a term sometimes used to describe early floppy-based disk operating systems such as CP/M
  • FDOS, the part of the Basic Disk Operating System (BDOS) implementing the filesystem in Digital Research operating systems such as the CP/M and DR-DOS families
  • FreeDOS, a free disk operating system
  • FDOS, First Day of Service

See also[edit]