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IO.SYS
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== Notes == {{Reflist|group="nb"|refs= <ref group="nb" name="NB_PC_DOS_Contiguous_files">The [[MS-DOS 5.0]] manual incorrectly states that the system files no longer need to be contiguous. However, for the boot process to work the system files still need to occupy the first two directory entries and the first three sectors of IO.SYS still need to be stored contiguously. [[SYS (DOS command)|SYS]] continues to take care of these requirements.<!-- See Chappell "DOS Internals" for further details --></ref> }}
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