dual booting question 2 hard drives

ok i have 1 compuer and 2 hard drives one hard drive has vista home primium and the other vista ultimate i want to put both hard drives in the 1 computer and be able to boot from each hard drive seperatly so i can oneday go on the vista ultimate and another go on the home primium could you tell me how i do this please and thanks

 

Post edited to remove non-pertinent information.

 

ok sorry im really lost could you explain that again please in simple terms thanks

 

I'm sorry, disregard this information.
What I said only applies to XP - VISTA is different.
Sorry if I caused confusion.
I'm going to edit my first response to reflect my error.

 

thanks any help would be great

 

The only information for a Vista/Vista, two drive, dual boot, refers to using the F8 key at boot time and selecting the 'other' drive as the boot drive from within the BIOS.
It seems to be more complicated than dual XP/2000 or even XP/Vista.

Another thought, is that in the case of XP, simply moving a drive into another case with different hardware may cause problems too.
Inasmuch as the system is looking for the same hardware that it started with.
I don't know if Vista would consider that as being a problem.