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GNU/Linux Booting Sequence

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GNU/Linux Booting Sequence

BIOS - GRUB - KERNEL - INIT

GRUB reads booting menu;
If the chosen partition is /dev/sdx it loads the kernel from /boot KERNEL detects the hardware mounts /dev/sdx on / and finds INIT (/sbin/init) which reads /etc/inittab to get into desired runlevel
(1 - single user, 3 - many users, non-graphical, 5 - many user graphical enviroment),
mounts file systems /etc/fstab and configures system with files found in /etc/rc.d.