Windows on an external drive isn’t officially supported if I remember right. Your screenshot seems to support that.
Honestly, I’d be leery of installing an OS on an external drive as they tend not to age well with heavy use.
Are you trying to necro a laptop with a dead drive? If so, depending on the model, it might just be worth replacing the internal drive so then you can go ahead with your dual boot plan.
Also, quick tip, install windows, then disable fast startup in windows, then disable safeboot in your bios. Otherwise, when it comes time to install mint, you might hit issues with windows saying “NO, MY DRIVE”.
If you install mint and get no grub screen, just boot mint with your live usb and look up repairing grub - should be nice and easy.
Windows on an external drive isn’t officially supported if I remember right. Your screenshot seems to support that.
Honestly, I’d be leery of installing an OS on an external drive as they tend not to age well with heavy use.
Are you trying to necro a laptop with a dead drive? If so, depending on the model, it might just be worth replacing the internal drive so then you can go ahead with your dual boot plan.
Also, quick tip, install windows, then disable fast startup in windows, then disable safeboot in your bios. Otherwise, when it comes time to install mint, you might hit issues with windows saying “NO, MY DRIVE”.
If you install mint and get no grub screen, just boot mint with your live usb and look up repairing grub - should be nice and easy.