Retrodavid

hey guys. ive got a sony mz-n520 net recorder which has been working great till recently. now it refuses to delete the discs via sonic stage or the player. if i try through the recorder it says track protect.if i try via sonicstage it wont transfier tracks to the pc or delete the disc. is there another way of getting music on a net player and deleting discs? software ect? many thanks