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Howdy Umakanth Ch! It sounds like you are storing the data correctly. Confusingly, ncdump will show NC_BYTE as signed numbers, as it says in the users guide: "It is possible to interpret byte data as either signed (-128 to 127) or unsigned (0 to 255). However, when reading byte data to be converted into other numeric types, it is interpreted as signed." So ncdump is showing you negative numbers, but if you read them in as unsigned numbers in another program, it all should work out. Please let me know if this didn't help... Thanks! Ed Hartnett Ticket Details =================== Ticket ID: WAI-600439 Department: Support netCDF Priority: High Status: Closed