@Override
  public File[] getDiskDirs() {
    File[] result = new File[diskDirs.length];
    System.arraycopy(diskDirs, 0, result, 0, diskDirs.length);
    return result;
  }
The default disk directory size unit.
geode-core/src/main/java/org/apache/geode/internal/cache/DiskStoreAttributes.java