the hard disk for the OS, which contains an outdated MBR (Master Boot Record) partition, and which also must being converted to a GPT partition.Īnd reinstalling the OS is also out of the question for many users, since it often takes a lot of time to reinstall all the additional software on the new OS and set it up according to your needs. This is most likely due to the system disk, i.e. Unfortunately, changing from BIOS to UEFI in the BIOS setup is not enough, because after that the old operating system (OS) will no longer boot at all. The problem of many users (including mine) is that you can't just quickly upgrade from Windows 10 to 11 while the system is running if the good, old BIOS is still messing around in the background on the mainboard. To do this, any activated CSM compatibility mode must also be deactivated. Because Microsoft's specifications (apart from insane CPU specifications) for the new operating system only allow an installation if the UEFI mode on the mainboard incl. The release of Windows 11 on Octoshowed how far Microsoft's own statements can be trusted.Īfter the introduction of Windows 11, many Windows 10 PC users who want to upgrade to Windows 10 realize that they have to use the newer UEFI mode instead of the old BIOS mode. In 2014, Microsoft announced that Windows 10 should be the last major version of the operating system. UEFI is often referred to as UEFI BIOS, and its firmware setup continues to be referred to as BIOS setup UEFI = Unified Extensible Firmware Interface
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