What would be the best way to implement a custom range filter using Solr?

What would be the best way to implement a custom range filter using Solr?

What would be the best way to implement a custom range filter using Solr?
I.e. I want to show a filter "Harddrive" (for PC's), which can have a
value in the range from 32GB to 2TB. I want these values to be added to
the query to Solr as a range-facet.
What will be the solr query?