The box is as follows: W-10 OS, 32GB RAM, i3 Processor, four HD’s. The empty HD I want to install Mint on is known by Linux as sda1, a 500GB SATA drive. W-10 is on a 3TB drive partitioned as 2TB/1TB with the W-10 OS on the 2TB partition. There are a couple of storage HD’s and a USB external 3TB backup drive.
Linux Mint v-18.3 works superbly on this box as a live-boot OS simply operating in RAM. So I decided to load it on the empty HD designated sda1 by LinuxMint.
All goes well until I get to what must be close to the final launch-pad, and I get this notice, which I don’t understand the ramifications of. So I aborted the load until I can find out what the devil it means. I would prefer to not have to recover W-10 from backup, although I’m certainly not in love with it. It may well be the eventual victim of my total upgrade to Linux. Windows-10 has cost MS a lifelong fan, I started with DOS in 1990 and attended every MS gathering within a hundred miles.
But back to loading LinuxMint v-18.3 on this box:
[The choices on the Mint warning screen are: “Go Back”, or, “Continue in UEFI mode”.]
This machine's firmware has started the installer in UEFI mode but it looks like there may be existing operating systems already installed using "BIOS compatibility mode". If you continue to install Debian in UEFI mode, it might be difficult to reboot the machine into any BIOS-mode operating systems later.
If you wish to install in UEFI mode and don't care about keeping the ability to boot one of the existing systems, you have the option to force that here. If you wish to keep the option to boot an existing operating system, you should choose NOT to force UEFI installation here.
So can anyone here please enlighten me as to what to do, using plain English, not tech-speak?
[Note: One time I tried to dual-boot MS Vista with W-10 but W-10 threw a fit and wouldn’t allow it. “But”, the Boot Sector still thinks there is a Vista choice for dual boot. There is no Vista HD, so maybe that is the missing OS that would have used a “BIOS compatibility mode”, and it is still embedded into the existing W-10 Boot Sector, IDK...]