I am not able to open a netcdf file that is about 4 GB in size. Following is the message: ga-> sdfopen h0004.nc Scanning self-describing file: h0004.nc nc_open failure: File too large h0004.nc does not exist or is not a netCDF file. Couldn't ingest SDF metadata. If this was an HDF-SDS file, try gradshdf. I have GrADS 1.9b4 on a x86_64 running Linux. Please help. Aida