Opened "3_2_vds.h5" with sec2 driver.
vds_dset                 Dataset {6/Inf, 13/13, 19/19}
    Location:  1:800
    Links:     1
    Maps:      {5} Source {
                      2_a.h5   /source_dset
                      2_b.h5   /source_dset
                      2_c.h5   /source_dset
                      2_d.h5   /source_dset
                      2_e.h5   /source_dset
               }
    Storage:   5928 logical bytes, 0 allocated bytes
    Type:      32-bit little-endian integer
