code: public void setSectorsPerCluster(int v) {
          if (v == getSectorsPerCluster()) return;
          if (!isPowerOfTwo(v)) throw new IllegalArgumentException(
                  "value must be a power of two");
          
          set8(SECTORS_PER_CLUSTER_OFFSET, v);
      }
docs: Sets the number of sectors/cluster
  
  @param v the new number of sectors per cluster