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IO.SYS
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== Disk layout requirements == * The two first entries of the root directory must be allocated by {{Mono|IO.SYS}} and {{Mono|MSDOS.SYS}}, in that order.<ref name="msrq"/><ref name="Duncan_1988_MS-DOS_Encyclopedia"/> * {{Mono|IO.SYS}} must be the first file stored in the [[<!-- Design of the FAT file system#Directory table|-->FAT directory table]] for files.<ref name="msrq"/><ref name="Duncan_1988_MS-DOS_Encyclopedia"/> * The files {{Mono|IO.SYS}} and {{Mono|MSDOS.SYS}} must be [[Fragmentation (computing)|contiguous]].<ref name="msrq"/><ref name="Duncan_1988_MS-DOS_Encyclopedia"/> However, MS-DOS version 3.3 allows sector 4 and higher to be fragmented; version 5.0 allows the first 3 sectors of {{Mono|IO.SYS}} to be allocated anywhere (as long as they are contiguous).<ref group="nb" name="NB_PC_DOS_Contiguous_files"/><ref name="Chappell_1994_DOS-Internals"/><ref name="msrq"/><ref name="rxp"/> {{Mono|COMMAND.COM}} can be treated like any ordinary file.
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