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"RE: D5100 and Lexar Platinum 11 SDHC memory card"
Hi Helen,Definetly sounds like a corrupted card.Sandisk and Lexar are the top two brands of memory cards. Both make very reliable products. While anything electronic can fail at any time the odds are on your side.I would exchange the card for a new one. Don't forget to format the new card in the camera before you use it.