I don’t remember if Windows updates would cause it but installing Windows second definitely would. Likewise, I think upgrading (from say Windows 7 to 10) might. Basically Windows is just like “this MBR? It’s actually mine, thanks.” With no option to not erase it.
EFI systems don’t use the MBR. Windows will default to using the whole disk if you don’t use the “advanced” button, but so will most linux distro installers.
With EFI systems this doesn’t matter. It was an issue with the legacy BIOS bootloader systems about a decade ago though.
I don’t remember if Windows updates would cause it but installing Windows second definitely would. Likewise, I think upgrading (from say Windows 7 to 10) might. Basically Windows is just like “this MBR? It’s actually mine, thanks.” With no option to not erase it.
EFI systems don’t use the MBR. Windows will default to using the whole disk if you don’t use the “advanced” button, but so will most linux distro installers.
I’m talking about BIOS, yeah, sorry if it was unclear. My 2009 CPU is still hanging on. Barely.
Pretty sure it happened to me on UEFI as well