UEFI or UEFI+LEGACY works with Windows 10 installation.
UEFI or UEFI+LEGACY works with Windows 10 installation.
It seems the setup is taking longer than expected. You might have chosen a BIOS setting that’s causing delays, or you could adjust it later without issues. Note that your system still has Windows 10 installed from your old PC.
Previously I chose legacy plus UEFI, then installed Windows. Windows changed my SSD to work only in legacy mode. When I attempted to set it to UEFI in BIOS, the system couldn't recognize my SSD. Also, the legacy + UEFI extension was removed after that.
UEFI only ensures Windows 10 boots securely in UEFI mode. It supports HDDs larger than 2TB, offers quicker installation times, and allows legacy installations. The OS installs with an MBR partition format, which is ideal for older systems that can’t run UEFI and doesn’t support secure boot or partitions exceeding 2TB (since it uses the MBR format).
UEFI only. Ensure CSM is turned off if available. Legacy setup for older operating systems like Windows 7 or earlier, or for very old hardware that conflicts with UEFI. Also, when booting from a USB drive to install an UEFI-compatible OS, select the option starting with "UEFI" if provided.
You can start your old Windows 10 version on new hardware and verify whether it uses UEFI or legacy format. This can be done by booting the previous system in UEFI-only mode—if it boots successfully, your current installation is already in UEFI. The Windows installer might face issues with a Windows UEFI setup if the drive is formatted as MBR (or Legacy if GPT is used). For a legacy setup, you can convert it using the included mbr2gpt tool found in Win10, or keep it unchanged. If you need to reinstall for any reason, changing the drive from MBR to GPT is best handled with a partition manager such as MiniTool Partition Manager.
Check the conversion process carefully. When you attempt MBR2GPT, the system may reject it due to format incompatibility. Ensure your installation matches the required GPT structure and verify the bootloader version. If using Windows, confirm the correct boot device settings and consider using a compatible recovery tool.
Are you selecting the right disk? https://www.windowscentral.com/how-conve...windows-10 Verify your drive contains the MBR. If it's already GPT, you're using UEFI and no conversion is needed.
I didn't pick the disk; it chose it on its own because only one disk was available. Confirmed it won't boot without the CSM enabled.
Usually the USB you're using for startup is also a disk drive. Just go to the link I provided or keep using the old boot method. The difference isn't significant. As long as your system starts, you can proceed either way.
I just tested it in a virtual machine and it crashed Windows. Even though it lists as compatible, switching between UEFI and BIOS on VMware didn’t help. For a real system, I’d suggest a fresh install to support large HDDs, fast startup, secure boot, and more.