Yes yes, not entirely meaningless of course, but what I'm trying to understand here is how exactly the computer knows whats written inside the boot file, when I don't see any definitions which would assign letters to partitions inside of it and the assignments can be completely unique for each Windows on the same machine. So in other words, the way I understand it now, the boot file must be read with the help of some reference file, because let's say
means something entirely different when viewed by this or that operating system, or not? How does the boot file know which letter assignments are to be used so that its contents make sense?
You mentioned "Secondary drive letters". Does that mean there are primary ones too? Do those determine what the contents of the boot file say?