Booting (booting up) in computing is the writ of starting the Operating System when the computer is switched on. A boot sequence is the initial disabuse like operations perfomed when the computer is switched on. Part frequently used bootloaders are GRUB, BOOTMGR, Syslinux, LILO , NTLDR. Linux booting process is much simple to understand and much things to learn.
For Linux, the most common boot loaders are LILO(LInux Loader), LOADLIN (LOAD LINux) and GRUB (GRand Unified Bootloader). LILO is the most reasonable boot loader for those users who employ Linux equally the main, either only, operating system.LILO is a eminently fast bootloader. LOADLIN is used by those who have multiple operating systems. LOADLIN is sometimes used as a backup boot loader for Linux in case LILO fails. GRUB is preferred by many users of Red Hat Linux.
A oust loader consists of three programs:
The boot sector program (512 bytes) is directly loaded by the BIOS at boot time.
The instant stage program is loaded by the boot sector program and it receptacle do everything you program it for.
The boot loader installer is used to install the boot loader and the second stage program onto the boot disk. These have to be stored in special locations, into the rudimentary sector of boot device. Indeed they cannot treffen copied with a mere emulate command.
Now we shall compare the features of mostly used GRUB and LILO bootloaders.GRUB is capable of loading a variety of free and proprietary operating systems. GRUB will work well with Linux, DOS, Windows, or BSD. GRUB is dynamically configurable which means changes can be made during the boot time, which includes altering existing boot entries, adding custom entries, selecting different kernels, or modifying initrd. GRUB supports Logical Block Address order meaning if the computer has a modern BIOS which can access more than 8GB (first 1024 cylinders) of hard disk space, GRUB will automatically be able to access it. Besides these GRUB can be run from or be installed to any device relish floppy disk, hard disk, CD-ROM, USB drive, network drive and can saddle operating systems from just as many locations, including network drives. It can also decompress operating system images antenatal booting them.
LILO is a sensible option for much Linux users and is a fast bootloader. LILO does not depend on a particular file system.One about up to sixteen different images can be selected at boot time. Parameters can be clique independently for every kernel. LILO can be arranged either in the master boot record (MBR) or the boot section of a partition. At system start, only the BIOS drivers are available for LILO to open hard disks. So with very old BIOS, the accessible area is limited to cylinders 0 to 1023 of the pristine two hard disks. For later BIOS, LILO can use 32-bit logical block addressing (LBA) to door unanimity the hard disks that the BIOS allows. LILO has some disadvantages though compared with GNU GRUB.
LILO supports only up to 16 different boot selections; Uncover supports an unlimited number of casing entries.
LILO cannot boot from network.
LILO must be written again every instant you change the configuration file; GRUB does not.
LILO does not have an interactive direct interface.
Finally, there are multiple choices of bootloaders which work with the Linux operating system of which the user can choose the ones best suited for the requirements.