Does ArcMap crash when adding other raster format data? Does the issue occur with all .sdat format data?
I don't have .sdat data with me to test.
But you may
1. Close all ArcGIS applications, and open a new ArcMap session.
2. Make sure the .sdat file format is enabled for ArcMap to read(Customize > ArcMap Options > Raster > File Formats).
4. Ensure the video adaptor is up-to-date.
If nothing works out, it would be wise to call Esri Tech Support to resolve the issue.