Pardon my curiosity, but when you refer to NC_MAX_DIMS, do you mean that you have at least 1 variable that has 65000 dimensions? Or do you mean that the total # of dimensions in the data set is 65000, but that no single variable uses all of them? =Dennis Heimbigner =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: IOD-794288 Department: Support netCDF Priority: Normal Status: Open