BIOS mode

UEFI (Unified Extensible Firmware Interface) is a modern standard that has largely replaced the traditional BIOS. It offers enhanced features such as faster boot times, improved security, support for larger storage drives, and a more user-friendly graphical interface. In contrast, legacy BIOS operates using 16-bit code and provides limited options for configuration. Both serve the same core purpose of initializing hardware and loading the operating system during startup, but UEFI is significantly more advanced and versatile.

This article explores the differences between UEFI and BIOS, focusing on their functions, advantages, and how they impact system performance and user experience. Understanding these technologies is essential for anyone looking to optimize their computer's settings or troubleshoot boot issues.

What is Thunderbolt BIOS Assist Mode?

Thunderbolt BIOS Assist Mode is a feature integrated into the system’s firmware that enhances compatibility with Thunderbolt technology. When enabled, this mode allows the BIOS to pre-allocate PCIe and memory resources specifically for Thunderbolt devices. This ensures smooth operation when connecting or disconnecting Thunderbolt peripherals without affecting system performance or stability.

By reserving necessary resources in advance, Thunderbolt BIOS Assist Mode helps prevent potential conflicts or performance drops caused by hot-plugging devices. It also improves the overall user experience, especially when working with high-speed external devices like docks, displays, or storage solutions.

What Does BIOS Mode Do?

BIOS (Basic Input/Output System) is responsible for initializing and testing hardware components before handing over control to the operating system. It performs the Power-On Self-Test (POST), configures hardware settings, and manages the boot process. Here are some key functions of BIOS mode:

  • Accessing BIOS: Users can enter BIOS settings by pressing keys like Del, F2, F10, or Esc during startup. This grants access to system configuration options.
  • Hardware Configuration: BIOS allows users to adjust settings such as enabling/disabling devices, managing memory, and configuring CPU parameters.
  • Boot Order: Users can define the order in which the system searches for an operating system, useful for booting from different devices like USB drives or hard disks.
  • System Settings: Options include setting the date and time, power button behavior, and managing power-saving features through ACPI.
  • Security Features: BIOS supports password protection and Secure Boot, helping protect the system from unauthorized access and malware.

Do I Need To Enable Thunderbolt In The Bios?

Yes, in certain systems, you may need to enable Thunderbolt in the BIOS before using Thunderbolt 3 hardware. This is especially true for some PCs where Thunderbolt functionality is disabled by default. The steps to access and change this setting vary depending on the manufacturer and BIOS version.

To ensure proper functionality, consult your computer or motherboard manual for specific instructions. In some cases, a BIOS update might be required to activate Thunderbolt capabilities. Always verify the correct procedure before making any changes to avoid potential issues.

What is UEFI Boot Mode?

UEFI (Unified Extensible Firmware Interface) is a modern replacement for the traditional BIOS. It offers enhanced performance, better security, and greater flexibility. Unlike BIOS, which uses a 16-bit architecture, UEFI runs in 32-bit or 64-bit mode and supports a graphical interface.

UEFI Boot Mode
UEFI Boot Mode

UEFI boot mode allows the system to load the operating system directly from storage devices, bypassing the traditional POST process. This results in faster boot times and better support for large storage drives. Additionally, UEFI includes features like Secure Boot, which protects against unauthorized software, and supports booting from various devices such as USB drives and SSDs.

Note: While many refer to UEFI as "BIOS," it is a distinct and more advanced firmware interface. Modern computers typically use UEFI instead of legacy BIOS.

Functions of UEFI Boot Mode:

  • UEFI provides a more efficient way for the OS to communicate with the firmware, improving the boot process.
  • It offers enhanced security features, such as Secure Boot, which prevents unauthorized software from running during boot.
  • UEFI supports both UEFI and legacy BIOS modes, giving users flexibility in choosing the appropriate boot method.
  • Firmware menus allow users to configure settings, select boot devices, and manage system options during startup.
  • UEFI enables the loading of UEFI drivers and applications, providing more advanced pre-boot capabilities.

What Is The Difference Between UEFI And Legacy Bios Mode?

Choosing between UEFI and Legacy BIOS mode depends on your hardware, system requirements, and personal preferences. Here are the main differences between the two:

BIOS UEFI
Runs on Legacy Hardware Runs on both legacy and newer hardware
Only supports DOS and Windows Supports Windows, Linux, and Mac operating systems
Smaller file size and uses less memory Larger file size and uses more memory but provides more functionality
Boots via traditional method from MBR Boots via modern method from GPT partition
Limited to 2TB storage support Supports storage devices larger than 2TB
Fixed 16-bit architecture Modern 64-bit architecture that is upgradeable
Can only address lower memory Supports High-resolution graphics and inputs
Firmware cannot be updated without a flash ROM chip Firmware updates are easy and don’t require flash ROM chip replacement
Limitations in booting from external devices Better support for booting from external devices like USB, SD cards, etc

How Do I Change Thunderbolt Settings In BIOS?

Changing Thunderbolt settings in the BIOS is a straightforward process. Here’s a general guide on how to do it:

  • Step 1: Access BIOS
    Restart your computer and enter the BIOS setup utility. This is usually done by pressing a specific key during the boot process, such as F2, Del, Esc, or F10. The correct key should be displayed on your screen during startup.
  • Step 2: Navigate to Thunderbolt Settings
    Once in the BIOS, use the arrow keys to navigate through the menus. Look for sections like “Advanced” or “Peripheral Configuration.”
  • Step 3: Locate Thunderbolt Configuration
    Within the advanced settings, there should be an option for Thunderbolt configuration. It may be labeled as “Thunderbolt Configuration,” “Thunderbolt Security,” or something similar.
  • Step 4: Adjust Thunderbolt Settings
    Enter the Thunderbolt configuration menu and adjust settings such as security levels, port configurations, and device enumeration based on your needs.
  • Step 5: Save and Exit
    After making your changes, save the settings and exit the BIOS. This is typically done by selecting “Save Changes and Exit” or a similar option. Confirm your selection and restart your computer with the new settings applied.

How To Unlock Advanced Settings In BIOS?

To unlock advanced settings in the BIOS, keep in mind that availability varies depending on your computer's manufacturer and model. Here are some general steps you can try:

  • Step 1: Restart your computer and access the BIOS settings. The key to enter the BIOS can vary, but common keys include F2, Del, Esc, or F10. Check your computer’s documentation or look for on-screen prompts during startup to determine the correct key.
  • Step 2: Once in the BIOS, navigate to the “Security” or “Advanced” section. The location of advanced settings may vary depending on your BIOS version and manufacturer.
  • Step 3: Look for an option related to “BIOS Lock” or “Advanced Settings Lock.” This option may be labeled differently, but it is typically used to restrict access to advanced settings.
  • Step 4: If the “BIOS Lock” or “Advanced Settings Lock” option is enabled, you will need to disable it to unlock the advanced settings. This may involve entering a password or a specific key combination. Refer to your computer’s documentation or contact the manufacturer for instructions on how to disable the lock.
  • Step 5: Save your changes and exit the BIOS settings. Press the appropriate key (usually F10) to save the changes and restart your computer.

If this method does not work, try these alternatives:

  1. Boot up your computer. When you see the startup logo screen, press CTRL+F10 and then CTRL+F11 to get into the BIOS. (It only works for some computers and you may need to try it a few times until you get in).
  2. Boot up your computer and then press the F8, F9, F10, or Del keys to get into BIOS. Then quickly press the A key to show the Advanced settings.
  3. In the BIOS, press Fn+Tab for 3 times.

If none of the above methods work, your computer may have locked the advanced settings by default, and there may be no way to unlock them.

Note: Not all computers allow users to unlock advanced settings in the BIOS. Some manufacturers may restrict access to prevent users from making changes that could potentially damage the system. If you are unable to find the option to unlock advanced settings in your BIOS, it is likely that your computer does not support it.

BIOS and UEFI perform similar functions in a computer, although their underlying mechanisms differ greatly. While UEFI is the superior choice for modern systems, it is not possible to upgrade a legacy motherboard to UEFI. The only way to switch to UEFI is through a hardware upgrade. So, are you using a new system with UEFI, or an older one with BIOS firmware?

The main difference between UEFI and BIOS lies in their architecture and capabilities. While BIOS uses 16-bit mode and has a limited user interface, UEFI uses 32-bit or 64-bit mode and offers a more advanced graphical user interface.

UEFI is a 32-bit or 64-bit program written in C language. It is not limited to real mode and provides more addressable memory space. Legacy BIOS is a 16-bit assembly program that runs only in 16-bit real mode and provides only 1 MB of addressable memory.

Modifying BIOS settings can be risky, so always exercise caution. Incorrectly changing settings can cause the computer to not start, and some changes might damage the motherboard. It’s best to have some technical know-how before making BIOS changes. Here are some factors to consider when changing the BIOS mode:

  • Compatibility: Ensure that your hardware and operating system support the desired BIOS mode. For example, if you want to switch from Legacy BIOS mode to UEFI mode, you need to verify that your hardware and operating system are compatible with UEFI.
  • Backup: Before making any changes to the BIOS mode, it is highly recommended to create a backup of your important data. This will help you recover in case any issues arise during the process.
  • Manufacturer Guidelines: Different computer manufacturers may have specific instructions or recommendations for changing the BIOS mode. It is advisable to consult the documentation or support resources provided by your computer manufacturer for accurate and detailed instructions.
  • BIOS Update: In some cases, changing the BIOS mode may require updating the BIOS firmware. It is crucial to follow the manufacturer’s instructions carefully when performing a BIOS update to avoid any potential risks.

On the System Details page, select the Drive Encryption tab. Click More to see the firmware type. The firmware type will be either in BIOS or EFI (UEFI).

Legacy BIOS mode is compatible with older hardware and operating systems that may not support UEFI. If you’re using older hardware or need to run older software that doesn’t support UEFI, legacy mode may be necessary. Legacy BIOS is generally considered more straightforward.

Unified Extensible Firmware Interface (UEFI) is a specification for a software program that connects a computer’s firmware to its operating system (OS). UEFI is expected to eventually replace basic input/output system (BIOS) but is compatible with it.

UEFI mode is a newer and more advanced firmware interface that replaces the legacy BIOS (Basic Input/Output System). It allows for faster boot times, more secure boot processes, and support for larger disk sizes.

  • There is a sticker on the BIOS chipset, which contains the default BIOS version.
  • When your computer is starting up, press F2 to enter the BIOS setup.
  • In Windows OS, you can use system detection software such as CPU-Z to check the BIOS version.
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