Command option Sample:format /S

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format /S option

FORMAT /S formats disk and inserts the system startup files	Systems commands in DOS : http://www.ybet.be/en-operating/en-dos-4.php
format /s also make the disk bootable by writing a block of code to the boot sector and changing a byte in the boot header	Format /s under XP : http://www.computing.net/answers/windows-xp/format-s-under-xp/188756.html