Survey Says! Over the past few days, an amazing 777 HR20 users took the: HR20 Site Survey - Finding the Cures. Executive Summary: Percentage of HR20s Replaced To Date: 18.6% Percentage of HR20s Reformatted To Date: 39.2% However no user reported a single replacement if they were taking five key preventative measures. Please see the HR20 Site Survey - Finding the Cures for details. For each of the 47 variables, there are also US Maps and Histograms. In addition, there is a Summary Analysis and a Multi-Variable Analysis. All raw data and calculations are included.