My scanner started to report some unreadable sectors on a drive and then I started to get a very high number of read errors on the same drive in my Windows Event Log. After a reboot the system came up very slowly and then was reported as "missing" in drive pool. I removed the drive (from drive pool and physically) and connected it to another machine to run the HGST Drive Tool (WinDFT) on the drive before I send it for RMA. When I ran the tool I did a full surface scan and the tool reports the drive as having no errors.
Is it possible the scanner was wrong? Could this have been a cable or controller issue? Something on the PC itself? Or is is possible that the HGST tool is less conservative in what it considers to be a "good" drive. I don't want to put the disk back into my server just to have a problem again. Keep in mind that this disk is under a year old.