Do you see this message when turning on your Siemens CX75? Here is how to get rid of it. I got this information from Club Siemens.
First you need to backup your RS-MMC, and format your RS-MMC with your phone. After that never create folders without the phone, you must use only your phone to create folders. Now you are free to restore your files to RS-MMC :-).
Note: My firmware is version 16. Some people says its work with version 12. But don’t change to version 23, it’s not stable.