![]() ![]() (Note that the partitions are not deleted automatically the installer just won't continue instead.) So if the Windows USB stick is literally only thing you have, and if the graphical installer is the only thing you know, there is no other way to proceed – to the commenters, it probably seems that in order to do a BIOS-mode install you have to delete all partitions first and let the installer convert the now-empty disk from GPT to MBR. DISKPART) only support converting empty disks between GPT and MBR. The problem is that the built-in tools that come with Windows (i.e. ![]() (And the same happens in UEFI mode if the disk was MBR-partitioned, the installer will insist on it being GPT-partitioned instead.) So if you're booting the installation USB stick in BIOS mode, but your system disk was previously GPT-partitioned (it had an UEFI-mode installation), then the Windows installer will generally refuse to do anything with it – it will only allow installing to an MBR-partitioned disk. MBR for USB stick → BIOS mode for USB stick → BIOS mode for installed OS → MBR for system disk) On top of that, Windows also wants the system disk's partition table to match the boot mode – BIOS systems typically use MBR for the system disk, while UEFI systems normally use GPT. That is, if the USB stick was booted in BIOS mode, then it will want to install Windows to always boot in BIOS mode as well, and the same for UEFI. However, whichever mode the Windows installer is booted in will also be used for the final installed system. ![]() This isn't very surprising for old computers they had mediocre UEFI implementations for a while.) (As the USB stick doesn't have full GPU drivers, it uses the firmware-provided video output to display stuff on screen – and apparently on your computer this doesn't work completely right in native UEFI mode, but does work in BIOS-emulation mode. The important part is the "Target system" choice – if you choose MBR as the USB stick's partition scheme, it'll result in the USB stick being prepared for BIOS-mode boot process (as opposed to UEFI-mode boot), and that's where the main difference lies. Selecting "MBR" for the USB stick isn't actually the main point. However, I suspect that those comments are talking about something a few steps ahead, where it may seem as if you end up being forced to manually delete partitions. The partitions are never deleted automatically, no matter which option you choose. ![]()
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