It’s possible he did have a C drive and just wasn’t looking correctly
But it is possible to install Windows on non-c drives, It just isn’t standard. The main reason is because you want the operating system to be on a different drive to the files. I have Windows installed on C but there’s absolutely nothing else on C just Windows everything else is on the E drive, but there’s absolutely no reason you couldn’t reverse that it’s just you’d have to start off with Windows on C, then remap D to not the disk, then installed Windows on D, set D to be the boot drive, And then finally uninstall it from C.
It’s unlikely that you would do all that by accident. Especially because setting anything other than C to be the boot drive usually requires changing the BIOS. You can’t do it from within windows because then you end up with a “the call is coming from inside the house” situation.
It’s possible he did have a C drive and just wasn’t looking correctly
But it is possible to install Windows on non-c drives, It just isn’t standard. The main reason is because you want the operating system to be on a different drive to the files. I have Windows installed on C but there’s absolutely nothing else on C just Windows everything else is on the E drive, but there’s absolutely no reason you couldn’t reverse that it’s just you’d have to start off with Windows on C, then remap D to not the disk, then installed Windows on D, set D to be the boot drive, And then finally uninstall it from C.
It’s unlikely that you would do all that by accident. Especially because setting anything other than C to be the boot drive usually requires changing the BIOS. You can’t do it from within windows because then you end up with a “the call is coming from inside the house” situation.