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Jason, I'm very sorry, I had the wrong name for the constant for netCDF-4 files created from the Fortran-90 interface. It's apparently NF90_FORMAT_NETCDF4, not NF90_NETCDF4. Please tell me if the following Fortran-90 program compiles OK for you: program s0 use netcdf implicit none integer status, ncid, dimid status = nf90_create("foo.nc", or(nf90_clobber,nf90_format_netcdf4), ncid) status = nf90_def_dim(ncid, "dim", 1, dimid) status = nf90_close(ncid) end If not, we'll have to determine what that problem is first before diagnosing the problem with large variables. Thanks. --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: YTY-788071 Department: Support netCDF Priority: Normal Status: Closed