All drives will fail. You're just buying time (or rather, the likelihood of getting more time out of the drive). I've had a couple of WD reds fail. You pop in

All drives will fail. You're just buying time (or rather, the likelihood of getting more time out of the drive). I've had a couple of WD reds fail. You pop in another and rebuild the volume. It's normal as long as it's not too often.