I currently dual boot Windows 7 and XP. I know XP was installed first, and then at some point, I added a hard drive with Windows 7. I used EasyBCD from Windows 7 to setup the bootloader.
Now, I would like to reformat the XP drive (and use it for media storage), and use Windows 7 only. However, I'm worried that I might lose the master boot record (MBR) or not be able to boot into Windows 7.
Is there a way to know which drive stores the MBR? I'm not even sure I understand exactly how the MBR manages two OSes, or if each drive gets an MBR, or if that makes a difference in this case. Anything that could help save me a headache down the road would be helpful.