Disk operating system

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A disk operating system (DOS) is a computer operating system that provides storage access limited to disk hardware (such as a floppy, hard drive and optical)^{[disputed – discuss]} that today is obsolete. A DOS provides a file system and a means for loading and running programs stored on the disk. Typically, a DOS was loaded from the disk as part of the boot process. More complex and modern operating systems such as Windows and Unix-based are not considered a DOS.^{[citation needed][1]}