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Question: NDX 400 USB

I recently bought two NDX 400 cd/mp3 players and when I load my SONY 2.0 flash drive in either of them I get this: " FO - SEL EMPTY" and nothing happens. I know my flash drive has music in it. Do I need to by a certain type of flash drive? If so which flash drive would you recommend?

Thank you,

Richard Alvarado

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