Microsoft → [XPPro] triple boot with win 7 64 pro, and two xp 32

Hi - I have three hdds each with its own os (Win 7 pro and two with xp pro 32). I added the second xp since the original disk was full and is 7 years old so I wanted to have a second hdd that I would use. When I boot the pc only two of the hdds appear, the win 7 and the original xp. I have a ASUS M3A78_EM board. If I disconnect the leads to the old xp and win 7 the pc does see the new hdd. I guess if I disconnect the lead to the old xp the wbm will see the new hdd, but I do not want to have to to that. Is there a solution?

Thanks