Two internal matched laptop SATA drives and a backup Esata drive. [i have had so much grief with Vista that i want backups] Although oddly numbered, this worked perfectly for six months: Drive 1 C vista Drive 1 G data Drive 2 F vista Drive 2 I data Esata 1 L vista Estata 1 M data On saturdays I backup drive 1 to drive 2. Once a month, I backup to esata. All perfect so far, dual boot to either drive 1 or drive 2 I just installed the monster MS Office Suite and suddenly it will not boot, nor show the BCD boot option. Dead stuck. Inside CMOS [F2] I swapped drive 1 and drive 2 boot sequence and it sort of works. It gives me the boot option list, and I choose drive 1 -perfect. But in Eassy BCD 1.7.2, it will not allow me to use F as a boot. I select F, but it comes back "U". I have no idea where "U" came from. I also cannot boot to drive 2 any longer. I tried to delete all BCD entries, reset MBR, and start over. It shows drive 1 [C] fine, but insists on using drive "U" for the second drive, which does not work.