Macbook, from May 2006, original HD replaced by Apple after about 6 months. Recently, the MB is frequently freezing, and sometimes after I either move it or pick it up from a stationary position. I ran SMART utility and it detected overall SMART status: FAILING READ FAILURE. Thinking that this could be the start of the HD going bad? Could this be corrected by wiping the drive and reinstall or just replace it?