What is a bootloader? What are the types of bootloaders?


These are some of the questions that will be answered in this blog. In particular, we will explore what a bootloader is, what its functions are, and the different types of bootloaders that are available. We will also look at how to install a bootloader and what you need to keep in mind when doing so. So if you’re curious about this important part of your computer’s firmware, read on!

What is a bootloader and what are its functions?

A bootloader is an integral part of a computer’s operating system. Without it, computers would not be able to launch their operating systems. To put it simply, a bootloader is a small program that runs when you turn on your computer or device and loads the operating system into memory so that it can be accessed. 

The primary purpose of a bootloader is to load the necessary components, such as drivers and firmware, into memory before starting up the main operating system (OS). This ensures that all of the necessary components are loaded and ready for use before the OS begins running. 

Functions Of A Bootloader 

Bootloaders have several important functions in addition to loading essential components into memory. They can also help with troubleshooting problems with your computer or device by displaying error messages or providing diagnostic information about hardware issues. Additionally, they can provide additional security measures by authenticating software updates before allowing them to run on your system. Bootloaders can also enable you to customize your device’s startup process or even change its default OS if desired. 

The different types of bootloaders

BIOS Bootloader 

The BIOS bootloader is the oldest type of bootloader. It was originally developed by IBM in 1976 and has since been updated many times over the years to keep up with modern hardware and software demands. The BIOS bootloader is stored in read-only memory (ROM) on your motherboard and it loads very basic information about your system, such as what kind of processor it has, how much RAM it has, etc., before passing control to another program called the master boot record (MBR). The MBR then takes over from there and loads the operating system into memory. 

UEFI Bootloader 

The UEFI bootloader is an improvement over the traditional BIOS bootloader and was designed to address some of its shortcomings. The UEFI bootloader supports much larger files than its predecessor, allowing for faster loading times and a more efficient startup process. Additionally, the UEFI bootloader provides improved security features by allowing users to encrypt their hard drives or even set up secure passwords for access to their devices. 

GRUB Boot Loader 

The GRUB (Grand Unified Boot Loader) is a popular open source software package that can be used to create complex multi-boot configurations with multiple operating systems installed on one machine. The GRUB was initially created by Free Software Foundation as part of their GNU project but has since been ported to other platforms like BSD Unix, Linux, Mac OS X, Solaris, AIX, HP-UX and Windows NT/XP/Vista/7/8/10. It provides users with a graphical user interface (GUI) which makes setting up a multi-boot configuration easier than ever before. 


How to install a bootloader?

Installing a bootloader may seem like an intimidating task, but it’s actually pretty straightforward if you follow the steps correctly. Here’s what you need to do: 

  1. Download the latest version of the boot loader from its official website or GitHub repository. 
  2. Unzip the file(s) with WinRAR or 7-Zip, depending on which type of file it is (e.g., .rar or .zip). 
  3. Copy all necessary files from the extracted folder into your USB drive or other storage device that is connected to your computer via USB port or SATA cable connection respectively.  This includes both BIOS files, as well as any other required files such as drivers, etc.  Depending on which type of BIOS you have installed, different files may be required for installation of the new boot loader; check with your laptop/desktop manufacturer’s website for details on which specific files are needed for installation on each model laptop/desktop device respectively). Additionally, some laptops/desktops require installation of multiple BIOS versions before updating with new one; again please refer to manufacturer’s website for specific instructions pertaining to each laptop/desktop model specifically here too!  Once all necessary files have been copied onto storage device successfully.  
  4. Reboot your computer and enter BIOS/UEFI setup mode by pressing designated key during POST (Power On Self Test) screen when powering on laptop/desktop; note that each make & model device has its own designated key(s) which needs pressing in order for entering into setup mode – usually F2 or Del keys work here but please refer back again here too just in case!  
  5. Once inside setup mode then look around for “Boot” section where we need selecting our newly prepared storage device containing all those BIOS related files previously downloaded & copied over earlier onto same – select appropriate option here now accordingly & save changes made before exiting BIOS/UEFI setup mode entirely afterwards too!  
  6. After saving changes above then reboot once more – if successful then new boot loader should now be installed onto laptop/desktop successfully & ready use afterwards too!  Congrats if everything went as planned without any issues encountered along way – otherwise troubleshoot problems encountered further before proceeding ahead any further still yet again though.


What do you need to keep in mind when installing a bootloader?

Research Different Bootloaders 

The first thing you’ll want to do is research different bootloaders to find out which one best suits your needs. This will require some technical knowledge, as each bootloader has its own set of features and capabilities. It’s important to compare the different options and choose the one that best fits your requirements. Make sure that you read through all the documentation provided by the manufacturer before making your decision. 

Understand System Requirements 

Once you’ve chosen a particular type of bootloader, you’ll need to make sure that your computer meets all of its system requirements. For example, if you’re installing a UEFI-based bootloader, then you’ll need to ensure that your motherboard supports UEFI functionality and that it is running the latest firmware version available from the manufacturer. It’s also important to check whether or not there are any compatibility issues with other hardware components or software programs on your computer. 

Follow Installation Instructions Carefully 

Installing a bootloader can be complicated and time-consuming, so it’s important to follow all instructions carefully in order to avoid any potential errors or problems down the line. Before beginning the installation process, make sure that you have all of the necessary files on hand (e.g., drivers, BIOS updates). Once everything is ready, read through each step thoroughly before attempting it so that you understand what needs to be done at every stage of the process. If something doesn’t seem right or does not match up with what is specified in the instructions then stop and double-check for accuracy before continuing further. 

To install a bootloader, get in touch with one of our technicians.

I am a computer engineer holding a bachelor's degree in Computer Science, complemented by a Master's in Business Administration from University of Strathclyde, Scotland. I currently work as a Senior IT Consultant in Melbourne, Australia. With over 15 years of...