How to remove Disk 0 when Windows is installed in Disk 1?

How to remove Disk 0 when Windows is installed in Disk 1?

I did a clean install of Windows 7 Ultimate x64 on a brand new hard disk that I installed in my machine and kept my existing Vista install intact. Windows 7 was installed on Disk 1, which it labeled c:. The old hard disk is listed as Disk 0, (System, Active, Primary Partition) and when I boot up I can choose which OS to boot, Vista or Windows 7, so I assume that it looks on that drive on startup.