We have a DS4100. We lost a drive recently and I tried replacing it with a drive that I got from amazon. Recovery guru comes back with an uncertified drive error. The drive is the same model as the rest of the drives. I do see that the firmware on each drive is the same except for the replacement. Would this be why I have and uncertified error? If so, do you think I would have any luck buying a replacement from IBM directly? I have tried contacting them but keep I getting run around with different numbers and different departments. Also the replacement parts online does not identify the IBM drive part number (71P298 Maxtor MaxLine Plus II 250GB SATA) I have no service contract with IBM. Any ideas on how I could possible get this thing fixed?