The Regenstein Library Map Collection owns hundreds of discs with spatial data and digital maps. These are searchable in the online catalog under the format of map not CD or DVD.
Sample search in the catalog:
How to search for spatial data in the library catalog:
Use the advanced search
Choose map as the format even if you are looking for data
Always add a place name to your search: state, country, region, etc.
Examples of keywords to use in a catalog search:
GIS file
GIS data
GIS database
Census data
Esri data