Both reading and writing (between computers with raid arrays). I measured the throughput with big media files actually (>500mb).

I am using NFS for years and I saturate my gigabit network..

I am working for the past ten years as a medical doctor in an Intensive Care Unit. We treat lots of trauma patients, especially due to motor vehicle accidents. I don't have any statistics in hand, but I am *absolutely* sure that there is a *vast* difference regarding the prevalence and the severity of brain injury amongst trauma patients after motorcycle accidents (patients having not used helmet have dramatically more often and more severe brain injury). According to my experience, I would never ride a motorbike.. :-) If I had to, I would definitely and absolutely use a helmet.