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Convert Windows 10 from the old BIOS to UEFI without Data Loss

Overview of Legacy BIOS and UEFI

Before attempting to convert from Windows 10 Legacy BIOS to UEFI, it is best to learn some basic knowledge first. In general, Legacy BIOS and UEFI are two different boot methods. The main difference lies in the process the firmware uses to find the boot destination. Firmware is software that acts as an interface between the hardware (motherboard) and the operating system.


Legacy BIOS is the boot process used by BIOS firmware. It stores a list of boot devices installed on the PC in order of priority. When the computer is turned on, the BIOS performs a power-on self-test (POST). After completing this operation, the firmware will load the first sector of each storage destination into the memory and scan it for a valid MBR. If found, the firmware passes execution to the MBR bootloader code, which allows the user to select the partition to boot. If no valid MBR is found on the current device, it will go to the next one in the startup command. If no valid MBR is found on all installed boot devices, Windows cannot start.


Boot process

UEFI boot is short for Unified Extensible Firmware Interface. It is considered the successor of the traditional BIOS. The firmware on UEFI boot maintains a list of valid boot volumes called the EFI service partition. During the POST process, the UEFI firmware will scan all bootable storage devices on your machine for a valid GPT and find the EFI service partition to boot from. If the EFI boot partition is not found, the firmware will revert to the Legacy BIOS boot method. If neither of these two methods work, Windows will fail to start.


Why convert Windows 10 from the old BIOS to UEFI?

From the above, I think you should know what the Legacy BIOS and UEFI boot methods are and how they work during the Windows boot process. So why do some users want to switch Windows 10, 8, 7 from Legacy BIOS boot mode to UEFI boot mode? This may be because UEFI has the following advantages over BIOS:

? UEFI allows users to handle hard drives larger than 2TB, while the old Legacy BIOS cannot because UEFI Use GPT disks, but Legacy BIOS uses MBR disks.

? UEFI can support up to 128 primary partitions on a GPT disk, and BIOS can have up to 4 primary partitions on an MBR disk.

? Thanks to various optimizations and enhancements, UEFI firmware can guarantee a faster boot process than BIOS.

? UEFI supports secure boot, which helps prevent viruses from loading during boot.


Steps to convert from the old BIOS to UEFI without reinstalling the operating system

To convert traditional BIOS to UEFI boot method before, you need to make sure that your motherboard complies with EFI / UEFI standards. Then convert the disk with Windows 10 from MBR to GPT, because UEFI uses GUID partition table (GPT), while traditional BIOS uses MBR partition table. Finally, change the boot mode from Legacy BIOS to UEFI in the BIOS settings. The specific steps are as follows:

* Only 64-bit Windows 10, Windows 8 or Windows 7 can boot from a GPT disk and use the UEFI boot mode. So first check whether your computer motherboard supports UEFI or EFI boot and whether the system is 64-bit, if not, please update it.


The first step. Convert the MBR boot disk to GPT without losing data

To convert the system disk from MBR to GPT, you can enter the WinRE environment and use the Windows built-in DiskPart command online. However, this will delete all partitions and data, of course, including the operating system. Therefore, you must reinstall the operating system from scratch after the conversion. If you want to convert without losing data, and then change the BIOS to UEFI without reinstalling the operating system, you can turn to AOMEI Partition Assistant Pro.

This software can be converted The disk (system disk or data disk) between MBR and GPT without deleting any existing partitions. You can click the button above to download the demo version and follow the steps to complete the task.

1. Install and run AOMEI Partition Assistant Professional Edition. Right-click the system disk and select "Convert to GPT Disk".

2. Click "OK" to confirm you Surgery.

3. Click "Apply" to confirm the hang Operation.

Then the computer will complete the operation in Win PreOS model.


Step 2. Convert Windows 10 from Legacy BIOS to UEFI

Then The Windows 10 system disk is converted from MBR to GPT, now you need to restart the system, boot to BIOS and select UEFI firmware.

PS .: If you do not change the firmware from BIOS to UEFI after the conversion, you will not be able to boot the operating system.

1. Turn on the computer and press certain keys continuously when you start to enter the BIOS setup menu.

2. When prompted on the BIOS screen, press F2 to access the BIOS setup utility. After a while, the BIOS setup utility will appear.

3. In the BIOS setup utility, navigate to the "Startup" tab on the top menu bar.

4. The boot menu screen appears. Select the UEFI / BIOS Boot Mode field and use the "+/-" key to change the setting to UEFI.

5. Press the "F10" key to save the changes and exit the BIOS.


Summary

Therefore, no data is required to convert Windows 10 from the old BIOS to UEFI If the system is lost or reinstalled, AOMEI Partition Assistant Pro can help you. In addition, it can help you transfer the operating system from the MBR to the GPT disk, expand the NTFS system drive without restarting the computer, repair damaged MBR, etc. To manage disk partitions in Windows Server operating system, you can use AOMEI Partition Assistant Server.



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