docs: function getSizeUnit(size) {
          var kbFactor = 1024;
          var mbFactor = kbFactor * 1024;
          var gbFactor = mbFactor * 1024;
          var tbFactor = gbFactor * 1024;
  
          if ((size / kbFactor) < 1024) {
              var r = (size / kbFactor).toFixed(2) + ' KB';
          }
          else if ((size / mbFactor) < 1024) {
              var r = (size / mbFactor).toFixed(2) + ' MB';
          }
          else if ((size / gbFactor) < 1024) {
              var r = (size / gbFactor).toFixed(2) + ' GB';
          }
          else if ((size / tbFactor) < 1024) {
              var r = (size / tbFactor).toFixed(2) + ' TB';
          }
          else {
              var r = (size).toFixed(2) + ' B';
          }
  
          return r;
  
      }