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[laomo]

My CASIO FX-9750GIII calculator has two different memory:

Main Memory and Storage Memory



When I tried to delete some file in C.BASIC, I got an error that the file can't not delete. series of trouble thing was began.



Then I tried to delete that file in system memory manager: I selected that file, tap the DEL button, after the progress bar finished quickly, the file WAS STAIL OVER THERE!!!



When I tap the OPT button in Memory Manager, I got an error message: Memory Error. Also, I tried to BACKUP someting to STORAGE Memory, another message said that THE STORAGE IS FULL.



When I connent to PC by USB, I select [USB FLASH], after PREPARING USB..., it says "Data conversion failed", I press EXIT and PC shows the CASIO USB drive, I can see every thing good in PC File Manager window, but I CAN NOT DELETE OR APPEND EVERYTHING, and PC shows a message: "I/O Error" , code is :0x8007045D



What is wrong with my calculator??