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The issue here appears to e chunking problem in invoking nc_def_var_chunking. The fact that it is returnging NC_EINVAL rather then NC_EBADCHUNK is odd. Can you post the .cdl file here if it is not too large? You can leave off any data: sections. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: ILN-571146 Department: Support netCDF Priority: Normal Status: Open =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.