One of my drives in my RAID5 array has come up with an error today. It was working fine all day, untill I restarted after installing windows updates (including an optional update of the RAID driver). I first tried a system restore just incase the new driver had messed things up, but no luck. I removed the defective drive from the array and went to test it in another pc. According to speedfan, the S.M.A.R.T readings are ok (if not great) at around 90% fitness, with the only worrying values being the 'Power on hours count' at 88, and the 'seek error rate' at 49. I also downloaded Seagate SeaTools to see what that would make of it. The Short Generic test passed without any problems, and it's in the middle of doing a Long Generit test. I have also tried formatting the drive (quick format mind you) and re-inserting it back into the RAID array, and trying to rebuild it, but the drive still shows an error. I'm using 4 1.5TB Seagate LP drives, and using the on-board RAID controller of my EVGA 680i sli motherboard in my server. The drives get plenty of airflow with 2 120mm gentle typhoons blowing air over them in my antec 300 case. What should I do now. The drive is still under warrenty, but considering it passed the short generic test in SeaTools, it doesn't look like Seagate would replace the drive, because there doesn't seem to be anything hugely wrong (wait and see if the long generic test picks something up). If there is nothing wrong with the drive, how should I go about wiping the drive and trying to put it back into the RAID array. I it just a case of re-formatting the drive, or do I have to wipe it in some other way? I'd prefer not to have to buy a new drive to replace it with. The RAID array is running with just 3 drives at the moment, but if another drive fails, I'll have lost all the data, so I need this fixed as quickly as possible. Thanks in advance for any info anyone has. Edit: here's a link to the S.M.A.R.T report for the drive, if it helps.