****!! Dont tell me this is because of vista install. I am also getting the same error on both my hard drives after I installed windows vista. I uninstalled it, formatted my frives, installed xp prof sp2 again, but the system has to be switched on n off many times before it boots. Sometimes it says, ntldr is missing n sometimes just cant read the disks. I have sent one of the hard drives back to seagate reporting the error as it was in warrenty period. But the other one is > 3yrs old so no luck