Thanks for that but I think you misunderstand the position. We are talking midifiles here-not mp3's. The hard drive is app 2 gigabytes-there are app 2000 midifiles on it and they take up 60.5 megabytes! The Kn 5000 will read up to 1920 files (16 files in each of 120 directories). In view of this I am sure the hard drive is not the problem. The midifiles on it can be played back perfectly.