Spencer Ng is a senior technical staff member with Hitachi Global Storage Technologies. Prior to that, he was a research staff member with IBM Almaden Research Center. Before joining IBM, he was a member of technical staff with Bell Labs in Naperville, Illinois. He has been a researcher in the field of storage for over twenty years, and is the holder of about twenty issued U.S. patents. For the past fifteen years, he is heavily involved in studying and developing various techniques for improving disk drive performance.