BIOS mode

UEFI (Unified Extensible Firmware Interface) is a modern standard that has largely replaced the older 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 uses a 16-bit architecture with limited options and functionality.

Both UEFI and BIOS are firmware types used during the startup process to initialize hardware components and load the operating system. They also allow users to customize settings and determine the boot order of devices. However, UEFI provides more advanced options and greater flexibility compared to traditional BIOS. This article explores the differences between UEFI and BIOS and how they function.

What is Thunderbolt BIOS Assist Mode?

Thunderbolt BIOS Assist Mode is a feature integrated into the computer's BIOS that enhances compatibility and performance when using Thunderbolt devices. When enabled, this mode pre-allocates PCIe and memory resources for the operating system to manage Thunderbolt peripherals efficiently. This ensures that plugging in or removing Thunderbolt devices does not cause system instability or performance issues.

By reserving specific system resources ahead of time, Thunderbolt BIOS Assist Mode helps maintain system stability. It prevents disruptions caused by hot-plugging Thunderbolt devices, which could otherwise lead to system crashes or slowdowns. This mode is especially useful for users who frequently connect and disconnect high-speed peripheral devices like external displays or storage units.

What Does BIOS Mode Do?

BIOS, or Basic Input/Output System, plays a crucial role in initializing hardware components and loading the operating system after a computer is turned on. Its primary functions include power-on self-test (POST), configuration of hardware settings, and managing device boot order. Here are some key aspects of BIOS mode:

  • Accessing BIOS: Users can access the BIOS setup utility by pressing a specific key during startup, such as Del, F2, F10, or Esc. The exact key depends on the manufacturer.
  • Hardware Configuration: BIOS allows users to adjust settings related to hardware components, including enabling/disabling devices, adjusting memory settings, and managing system voltages.
  • Boot Order: Users can define the order in which the system attempts to boot from different devices, such as hard drives, USB drives, or optical media.
  • System Settings: BIOS provides access to date/time settings, power button functions, and other system-specific configurations.
  • Security Features: BIOS includes options like setting a password or enabling secure boot to protect the system from unauthorized access.

Do I Need To Enable Thunderbolt In The BIOS?

Yes, in some cases, you may need to enable Thunderbolt in the BIOS before using Thunderbolt 3 hardware. Certain systems require manual activation of Thunderbolt through the BIOS settings. The steps to access and modify these settings vary depending on the motherboard manufacturer and BIOS version.

To ensure proper functionality, refer to your computer’s manual or contact the manufacturer for guidance. In some instances, a BIOS update might be necessary to activate Thunderbolt capabilities. You can typically find BIOS updates on the manufacturer's website. If unsure, it's best to seek assistance from the manufacturer to avoid potential issues.

What is UEFI Boot Mode?

UEFI (Unified Extensible Firmware Interface) is a modern replacement for the traditional BIOS. It offers numerous advantages, including faster boot times, better security, support for large storage drives, and a graphical user interface. UEFI boot mode refers to the method by which the firmware initializes hardware and loads the operating system during startup.

UEFI Boot Mode
UEFI Boot Mode

Unlike traditional BIOS, UEFI stores initialization and startup information in a .efi file located on the EFI System Partition (ESP). This allows UEFI to directly boot the OS without running the BIOS self-test, resulting in quicker startup times. Additionally, UEFI supports secure boot, advanced graphics, and pre-boot applications, making it a more powerful alternative to legacy BIOS.

Note: While some people still refer to UEFI as "BIOS," most modern computers use UEFI firmware instead. To distinguish between the two, terms like "UEFI BIOS" are often used for UEFI firmware, while "Legacy BIOS" refers to traditional BIOS.

Functions of UEFI Boot Mode:

  • UEFI provides a new communication method between the OS and firmware, allowing efficient OS boot processes.
  • It includes enhanced security features like Secure Boot, which ensures only trusted software runs during startup.
  • UEFI supports both UEFI and Legacy BIOS boot modes, with UEFI being recommended for Windows installations due to its security benefits.
  • Users can access various settings via firmware menus, typically accessed by pressing keys like Esc, Delete, F1-F12 during startup.
  • UEFI allows selection of boot devices and network options, with some devices requiring specific mode configurations.
  • UEFI supports loading driver and application images, which have access to runtime and boot services defined by the firmware.

What Is The Difference Between UEFI And Legacy Bios Mode?

Choosing between UEFI and Legacy BIOS modes involves considering factors like hardware compatibility, system requirements, and personal preferences. Here are the main differences between the two:

BIOS UEFI
Runs on Legacy Hardware Supports both legacy and newer hardware
Only supports DOS and Windows Supports Windows, Linux, and Mac OS
Smaller file size and uses less memory Larger file size but provides more functionality
Boots via MBR Boots via GPT partition
Limited to 2TB storage Supports storage over 2TB
Fixed 16-bit architecture Modern 64-bit architecture
Can only address lower memory Supports high-resolution graphics and inputs
Firmware cannot be updated without replacing the chip Firmware updates are easy and don’t require hardware changes
Limited boot support for external devices Better support for USB, SD cards, etc.

How Do I Change Thunderbolt Settings In BIOS?

Changing Thunderbolt settings in the BIOS is generally straightforward. Here's a general guide:

  • Step 1: Access BIOS
    Restart your computer and press the appropriate key (such as F2, Del, Esc, or F10) during startup to enter the BIOS setup.
  • Step 2: Navigate to Thunderbolt Settings
    Use the arrow keys to navigate through the BIOS menu and look for sections like “Advanced” or “Peripheral Configuration.”
  • Step 3: Locate Thunderbolt Configuration
    Find an option labeled “Thunderbolt Configuration,” “Thunderbolt Security,” or similar.
  • Step 4: Adjust Settings
    Modify options such as security levels, port configurations, or device enumeration based on your needs.
  • Step 5: Save and Exit
    Select “Save Changes and Exit” to apply your settings and restart the computer.

How To Unlock Advanced Settings In BIOS?

To unlock advanced settings in the BIOS, follow these general steps:

  • Step 1: Access BIOS
    Restart your computer and press the correct key (like F2, Del, Esc, or F10) to enter the BIOS settings.
  • Step 2: Navigate to Advanced Settings
    Look for a section like “Security” or “Advanced” to find the advanced settings.
  • Step 3: Disable BIOS Lock
    Locate an option like “BIOS Lock” or “Advanced Settings Lock” and disable it if enabled. This may require entering a password or specific key combination.
  • Step 4: Save and Exit
    Press F10 to save your changes and exit the BIOS. Your computer will restart with the new settings applied.

If these steps don't work, try the following alternatives:

  1. During startup, press CTRL+F10 and then CTRL+F11 to enter BIOS (works on some systems).
  2. Press F8, F9, F10, or Del during startup, then quickly press A to show advanced settings.
  3. Press Fn+Tab three times in the BIOS to reveal advanced settings.

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

While BIOS and UEFI perform similar functions, their underlying operations differ significantly. Although UEFI is the superior choice for modern systems, you cannot upgrade a legacy motherboard to UEFI. The only way to switch would be through a hardware upgrade. So, are you using a new system with UEFI or an older one with BIOS?

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, while Legacy BIOS is a 16-bit assembly language program. UEFI provides more addressable memory and advanced features compared to traditional BIOS.

Modifying BIOS settings can be risky, so always exercise caution. Incorrectly changing settings can prevent your computer from starting, and some changes might damage the motherboard. It's best to have some technical knowledge before making BIOS changes. Consider the following factors:

  • Compatibility: Ensure your hardware and OS support the desired BIOS mode.
  • Backup: Back up important data before making any changes.
  • Manufacturer Guidelines: Consult your manufacturer’s documentation for accurate instructions.
  • BIOS Update: Some changes may require updating the BIOS firmware.

On the System Details page, go to the Drive Encryption tab and click More to see the firmware type. It will display either BIOS or EFI (UEFI).

Legacy BIOS is compatible with older hardware and operating systems that may not support UEFI. If you're using outdated hardware or software, Legacy mode may be necessary. It is often considered simpler and more straightforward.

UEFI is a specification that connects a computer’s firmware to its operating system. While it is expected to replace BIOS, it remains compatible with it.

UEFI mode is a newer and more advanced firmware interface that replaces the legacy BIOS. It enables faster boot times, more secure boot processes, and support for larger disk sizes.

  • Check the sticker on the BIOS chipset for the default BIOS version.
  • During startup, press F2 to enter the BIOS setup.
  • Use system detection tools like CPU-Z in Windows to check the BIOS version.
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