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UEFI (Unified Extensible Firmware Interface) and legacy BIOS are two different types of firmware used to initialize and boot a computer. UEFI is the modern successor to the older legacy BIOS, offering several advantages such as faster boot times, support for larger hard drives, and improved security features.
You Should Know:
1. Check Firmware Type on Linux:
To determine whether your system uses UEFI or legacy BIOS, you can use the following command in a Linux terminal:
ls /sys/firmware/efi
If the directory exists, your system is using UEFI. If not, it’s likely using legacy BIOS.
2. Convert MBR to GPT for UEFI:
If you want to switch from legacy BIOS to UEFI, you may need to convert your disk from MBR (Master Boot Record) to GPT (GUID Partition Table). Use the `gdisk` utility for this:
sudo gdisk /dev/sda
Follow the on-screen instructions to convert the disk.
3. Secure Boot in UEFI:
UEFI supports Secure Boot, which ensures that only signed and trusted software can boot the system. To check if Secure Boot is enabled on a Linux system:
mokutil --sb-state
4. Boot Repair on UEFI Systems:
If you encounter boot issues on a UEFI system, you can use the `boot-repair` tool:
sudo apt-get install boot-repair sudo boot-repair
5. Windows UEFI Boot Manager:
On Windows, you can manage UEFI boot entries using the `bcdedit` command:
bcdedit /enum firmware
6. UEFI Shell Commands:
If you have access to the UEFI shell, you can use commands like `map` to list available file systems and `bcfg` to manage boot options.
What Undercode Say:
Understanding the differences between UEFI and legacy BIOS is crucial for system administrators and IT professionals. UEFI offers significant advantages over legacy BIOS, including faster boot times, support for larger drives, and enhanced security features like Secure Boot. By mastering the commands and tools related to UEFI, you can ensure smoother system operations and better security for your systems. For more detailed information, you can refer to the high-res PDF books available at study-notes.org.
References:
Reported By: Xmodulo Uefi – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
