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Many computers can only run existing code in working memory (ROM or RAM), modern operating systems are typically stored on hard disk, CD-ROM or other storage devices. Once the computer is turned on, it does not have an operating system into memory. The computer hardware can not do the actions of the operating system, how to load a program from the disk, so a seemingly insoluble paradox is created: to load the operating system into memory, we need an operating system already loaded, the boot process involves all the phases involved on turn on the computer and get ready to use the operational system.