We have a Dell 6800 server running windows 2003 standard. The raid5 has a perc4DI controller and recently one of the drives drive 0:0 failed and the server is running off the remaining 3 drives. The problem is few days ago the drive 0:1 went into predictive fail mode and is still online so we ordered 2 replacement drives. I spoke with 2 dell techs that said as long as server is up and running, once replacement drives arrive, i could replace drive 0:0 first and run a rebuild. They both said it was ok to run a drive consistency check on the drive after the rebuild. Problem was yesterday after i ran the rebuild which completed to 100%, overnight this new drive went into predictive fail mode as well. My question is, shouldnt i have tried repairing drive 0:1 first by running a drive consistency check on it so that when the new drive attempted the rebuild it wouldnt take bad portions from the predictive drive 0:1? Was told by a 3rd tech today that my only option is to go into bios and try retagging array and then taking drive 0:1 offline then replacing drive 0:0 with new 2nd drive which i didnt use yet from yesterday and there would be a 50% chance this would work without having to rebuild the server. Didnt sound very promising. My idea was to use the 2nd new drive to replace the first new drive that was rebuilt since its not in good condition now and then rebuild it after running drive consistency check on predictive drive 0:1 first. I always thought that in a raid5, as long as server is up and running and you still had 2 good drives online, that you could recover without rebuilding server. Thanks.