# core.system.base:System.hdf5


Get whether the system requires or uses HDF5 format for data storage.


`core.system.base:System.hdf5: bool`


Determines if HDF5 format is needed based on the structure of parameter chunks. HDF5 is required if any parameter: - Has a list/tuple of chunks but single name - Has nested tuple chunks - Has any chunk size greater than 1