Storage of diffraction data
Synchrotrons are very good at archiving all collected data. In contrast, there's no requirement for including diffraction data when submitting a structure to the PDB. Consequently, the connection between structure and the underlying data is lost for all practical purposes. Some think this is a problem, but there aren't any good solutions yet.
Diffraction data storage solution
As the PDB isn't developing data storage and retrieval solution, community efforts are needed. Here are a few examples: