When receiving new data, how does the Casio digital diary handle duplicate data items?
Unless you have an SF-M10/R10/R20 model, or an SF-5×80/5x90SY/6x00SY/7x00SY, it doesn’t. Redundant duplicate entries are created. The only duplication prevented in most models is two schedule entries with the same alarm time. To avoid duplication on uploads, you must erase the entire contents of the Digital Diary first, or use the data synchronization capability of PC software like CASIF/Win to filter the data.