The Disk 2 is the Windows 7 that was booted when the snip was taken.
If both Disk 0 and Disk 2 have separate bootable Windows 7 versions and you want to use the BIOS one-time boot menu to boot them independently?
Power down and disconnect the data cables from the mobo of Disks 1 & 2 and set Disk 0 as second boot device after the CD/DVD drive, boot the Windows 7 installer and do the 3 separate startup repairs to create separate boot files to Disk 0.
Startup Repair - Run 3 Separate Times
When Disk 0 is booting on its own, power down and connect (the previous) Disk 2 to the #1 SATA port of the mobo and set it as the first boot device in the main BIOS.
Then you should have the option to use the one-time BIOS boot menu to select which OS/HDD to boot at machine startup.
Be sure to post back here with an update.