It started with a smart error two weeks ago, it went fairly quickly. The two harddisk promptly give relatively the spirit I had been nch not me almost looks after unwanted decay.
Therefore caution in the disk type. Let's see how long the other three are still running. Warranty is unfortunately just wide.
Update 29/04/2015: Now the rest also defective. That was an expensive fun, something I had never had but in the last 10 years in WD drives. I am now changed to HGST - let's see. For I never called again but Seagate.