BIOS mode

UEFI (Unified Extensible Firmware Interface) is a modern standard that has replaced the older BIOS. It offers advanced features like faster boot times, enhanced security, support for larger storage devices, and a graphical user interface. In contrast, Legacy BIOS is an outdated system that uses 16-bit code with limited options.

Both UEFI and BIOS are types of firmware found on motherboards that initialize hardware and load the operating system. They also allow users to customize settings and determine the order in which devices boot. However, UEFI is more powerful and provides greater flexibility. 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 related to Thunderbolt technology and its integration with the computer's BIOS. In this mode, the BIOS pre-allocates PCIe and memory resources for use by the OS when connecting or disconnecting Thunderbolt devices. This helps prevent performance issues or disruptions caused by these actions.

When enabled, Thunderbolt BIOS Assist Mode ensures that specific resources are reserved for Thunderbolt devices, avoiding any negative impact on system performance. By pre-allocating resources, it maintains stability and prevents potential problems such as crashes or slowdowns during hot-plugging of Thunderbolt devices.

What Does BIOS Mode Do?

BIOS is responsible for identifying, configuring, testing, and connecting hardware components to the operating system immediately after a computer starts up. These tasks are part of the boot process. BIOS performs four main functions: Power-on Self-Test (POST), configuration of hardware and system settings, boot order management, and more.

  • Accessing BIOS: Users can access BIOS by pressing a key like Del, F2, F10, or Esc during startup. Once inside, they see a text-based or graphical interface to modify settings.
  • Hardware Configuration: BIOS allows users to configure hardware settings, including enabling/disabling devices, adjusting memory, and managing system voltages.
  • Boot Order: BIOS lets users change the order in which devices are checked for the OS, useful for booting from USB drives or other external devices.
  • System Settings: Users can adjust date, time, power button functions, and other system preferences through BIOS.
  • Security: BIOS includes features like passwords and Secure Boot to protect against unauthorized access and ensure system integrity.

Do I Need To Enable Thunderbolt In The Bios?

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

It’s best to consult your computer or motherboard manual or contact the manufacturer for guidance. In some cases, a BIOS update might be necessary to activate Thunderbolt capabilities. You can find updates on the manufacturer’s website. If unsure, seek professional assistance to avoid risks.

What is UEFI Boot Mode?

UEFI (Unified Extensible Firmware Interface) is a newer standard that replaces the legacy BIOS. It offers more features, such as faster boot times, better security, support for larger disks, and a graphical interface.

UEFI Boot Mode
UEFI Boot Mode

Unlike traditional BIOS, UEFI offers numerous new features and advantages, aiming to eventually replace BIOS. One key feature is storing initialization and startup information in a .efi file on a specialized partition called the EFI System Partition (ESP). This enables direct booting of the OS without going through the BIOS self-test, resulting in faster boot times.

UEFI boot mode provides benefits such as faster startup, support for large storage devices, secure boot via features like Secure Boot, and the ability to run pre-boot applications. Most modern PCs now use UEFI instead of BIOS. Some refer to UEFI as “UEFI BIOS” to distinguish it from the older “Legacy BIOS.”

Functions of UEFI Boot Mode:

  • UEFI defines a new communication method between the OS and platform firmware, allowing efficient boot processes.
  • It includes enhanced security features like Secure Boot, ensuring only trusted software loads during boot.
  • UEFI supports two boot modes: UEFI and Legacy BIOS. Windows is generally recommended to be installed in UEFI mode for better security.
  • UEFI provides firmware menus accessible during startup, allowing users to change settings using keys like Esc, Delete, F1-F12.
  • Users can select boot devices or networks from firmware menus, with options for both UEFI and BIOS modes.
  • UEFI allows loading of UEFI drivers and applications, which have access to runtime and boot services.

What Is The Difference Between UEFI And Legacy Bios Mode?

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

BIOS UEFI
Runs on Legacy Hardware Runs on both legacy and newer hardware
Only supports DOS and Windows Supports Windows, Linux, and Mac
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:

  • Step 1: Access BIOS
    Restart your computer and enter the BIOS setup utility by pressing a key like F2, Del, Esc, or F10 during startup.
  • Step 2: Navigate to Thunderbolt Settings
    Look for a section labeled "Advanced" or "Peripheral Configuration."
  • Step 3: Locate Thunderbolt Configuration
    Find an option like "Thunderbolt Configuration" or "Thunderbolt Security."
  • Step 4: Adjust Thunderbolt Settings
    Modify settings such as security levels, port configurations, and device enumeration.
  • 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 steps:

  • Step 1: Restart your computer and access the BIOS settings using keys like F2, Del, Esc, or F10.
  • Step 2: Navigate to the "Security" or "Advanced" section in the BIOS menu.
  • Step 3: Look for an option like "BIOS Lock" or "Advanced Settings Lock." Disabling it may require a password or key combination.
  • Step 4: Save your changes and exit the BIOS setup utility by pressing F10.

If this doesn't work, try these alternatives:

  1. Press CTRL+F10 and CTRL+F11 during startup to access BIOS.
  2. Press F8, F9, F10, or Del during startup, then press A to show advanced settings.
  3. Press Fn+Tab three times in the BIOS.

If none of these methods work, your computer may restrict access to advanced settings. Always consult your manufacturer if unsure.

While BIOS and UEFI perform similar functions, their underlying mechanisms differ significantly. Although UEFI is the superior choice for modern systems, there is no way to upgrade a legacy motherboard to UEFI. The only solution is to replace the hardware. 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 Legacy BIOS.

Modifying BIOS settings can be risky. Incorrect changes may prevent the computer from starting or damage the motherboard. Always have technical knowledge before making changes. Consider compatibility, backup, manufacturer guidelines, and possible BIOS updates before proceeding.

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 do not support UEFI. If you're using older hardware or running software that doesn't support UEFI, Legacy mode may be necessary. It is often considered simpler and more straightforward.

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 BIOS but is compatible with it.

UEFI mode is a newer and more advanced firmware interface that replaces the legacy BIOS. 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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