My wife has a slot radio we purchased at Radio Shack. The salesman sold us a blank card so we can record our own music. We are having a problem with it. We recorded about 100 songs the first time. 2 days later, we recorded another 100 songs or so. When she listened to it, the first 100 songs were gone. The salesman at Radio Shack suggested we try a card reader. Now we are not electronic buffs, we just want to listen to our music. What I'm asking is, should we purchase the card reader and if so, what one? Please help!

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