FS_VOLUME_CAPABILITY_READ_INDEX_DIR
if (!HasCapability(FS_VOLUME_CAPABILITY_READ_INDEX_DIR))
CLEAR_UNSUPPORTED(FS_VOLUME_CAPABILITY_READ_INDEX_DIR, read_index_dir);
fVolumeCapabilities.Set(FS_VOLUME_CAPABILITY_READ_INDEX_DIR,
fCapabilities.Set(FS_VOLUME_CAPABILITY_READ_INDEX_DIR,