Boot Loader

GNU grand unified bootloader (GRUB)

•  A multiboot specification that allows the user to choose one of several OSs

NT loader (NTLDR)

• A bootloader for Microsoft’s Windows NT OS that usually runs from the hard drive

Linux loader (LILO)

• A bootloader for Linux that generally runs from a hard drive or floppy disc

Network interface controller (NIC)

• Uses a bootloader that supports booting from a network interface such as Etherboot or pre-boot execution environment (PXE)