It was only when the design was able to pass strict enterprise-grade Zero Error standard of 400 units surviving 500 hours of the toughest continuous testing without a single error or failure that the drive was manufactured.

ENGADGET: Plextor M5 Pro bulges SSD envelope with 94K IOPS and 540MB/s

But investigators are focused on a failure of the train tracks themselves, as opposed to an error by engineers or a failure of the train's signal system.

WSJ: Probe of Metro-North Derailment in Connecticut Focuses on Rail

Hania said, however, it is more likely that a network error or system failure caused the problem.

CNN: Microsoft Web sites suffer large scale blackout