code: public long[] allocNew(int nrClusters) throws IOException {
          final long rc[] = new long[nrClusters];
          
          rc[0] = allocNew();
          for (int i = 1; i < nrClusters; i++) {
              rc[i] = allocAppend(rc[i - 1]);
          }
          
          return rc;
      }
docs: Allocate a series of clusters for a new file.
  
  @param nrClusters when number of clusters to allocate
  @return long
  @throws IOException if there are no free clusters