I found that the MP3 player has an option called "OnLine Mode" which shows 3 options: "Multi Drive", which shows both drives, "Only Normal" which shows only the 17 megs drive (H:) and "Encrypted Only" which shows only the 466 Megs one (I:) but doesn't solve my problem (Meaning that I still can't hear the music stored in the [I:] drive).
Someone told me that It may be partitioned, and when I checked both "partitions" one showed "Not appliable" as the type of partition and the other showed "Master Boot Record (MBR)" in the mentioned field.
Does anyone know how to solve this?