

So, just from what you’ve said, without getting more info from you, my guess as to what’s going on is that Windows has set things up to where it uses its own bootloader which isn’t set up to boot into Linux or chain-load your Grub2 or whatever Linux-capable bootloader.
And this F11 you’re talking about is probably the key your BIOS uses to let you into the BIOS configuration, yeah? And from there you can tell it to load Grub2 or whatever bootloader Mint set up when it was installed – the one that was nuked by Windows.
(I keep saying “Grub2”. It’s possible you selected something else like Syslinux or rEFInd or something when installing, but I think Grub2 is default for Mint.)
I think, just from some googling, what you’ll want to do, assuming the assumptions I’ve assumed above haven’t made asses out of anyone, is (in Mint with both SSDs plugged in):
>sudo grub-install <whatever your boot drive is -- something like /dev/sda or /dev/nvme0n1 or some such>
>sudo update-grub
(And you’ll need to replace the angle brackets part above with the actual drive name. sudo grub-install /dev/sda
or whatever.)
I think that first one should tell your system to switch from the Windows bootloader (which… I don’t think can even boot Linux… I haven’t used Windows since XP, so I don’t know for sure) to Grub2 which is capable of booting Linux, and capable of asking you which OS you want on boot. The second command is just to ensure Grub2 is properly configured. (It probably is already, but it won’t hurt to make double-sure.)
If that doesn’t work, it’s likely your Mint install is set up with a different bootloader. If that happens, I’d say:
- Let us know any error message you get from the above commands.
- Let us know what behavior you’re seeing instead of the desired results. (Like, no change and it’s still booting straight into Windows? Now it shows an OS-selection menu but only Mint as an option? Something else?)
- Search in your package manager for “bootloader” and report back which bootloader it says is installed.
Good luck! Hopefully that gets you going, but if not, definitely let us know your results!
Oh sweet! Glad you got it solved!