Your Curtis MP3 player is coming preformatted from the factory in FAT16. Although the max FAT16 file/folder limit is 512 for the root directory, long file names can reduce the number of available files and folders in the root folder. (Such is the case with MP3 song titles) This is due to a Windows FAT16 formatting limitation. SOLUTION: REFORMAT THE MP3 FILE SYSTEM IN FAT32. This should theoretically increase the maximum number of files/folders to 65,536 and thereby eliminate this type of problem.