Apparently, decay on the disk itself is sometimes caused by cosmic rays: http://docs.oracle.com/cd/E19253-01/819-5461/gbbym/index.html http://docs.oracle.com/c

Apparently, decay on the disk itself is sometimes caused by cosmic rays: http://docs.oracle.com/cd/E19253-01/819-5461/gbbym/index.html http://docs.oracle.com/cd/E19253-01/819-5461/gbbym/index.htm...