is due to the 24-bit addressing in the firmware. Some confirmed compatible cards: Sandisk CF Ultra II 1GB/2GB Sandisk CF Ultra 8GB Sandisk CF Ultra II 4GB See also Trekstor Vibez Rio Karma Empeg Car References External links Rio's list of hard drive audio players Rio Audio Expands its Award-Winning Lineup of MP3 Players - press release Forum thread about unreleased Rio firmware "3.02 and 3.04 The Developer's Cut" via the Wayback Machine (3.04 Download link 1) (3.04 Download link 2) Products introduced in 2004 Digital audio players