Bootable OS is selected from the boot menu of the BIOS.
Not the OS drive! Yes, that's the difference.
To catch every time the time to press F2
And what to alleviate stupidly hit eight times with a pause of 1 tenth of a second and all.
Are there any loaders
If I remember correctly, the Win10 loader can load Linux (or rather to give them control).
Since you're not very whisking - you programmulina EasyBCDBoot anything.
Windows, Linux, macOS & BSD! Boot both from and into USB drives, ISO images, virtual disks, and more.