docs: function findDriveWwidByIndex(catalog, isEsx, driveIndex) {
          var wwid = null;
          _.forEach(catalog, function(entry) {
              if (entry.identifier === driveIndex) {
                  wwid = isEsx ? entry.esxiWwid : entry.linuxWwid;
                  return false; //have found the result, so we can exit iteration early.
              }
          });
          return wwid;
      }