Sounds like it was a good quality well-trained BS artist salesman... LOL.
K1W1 is correct, there is no such thing as a double density SD card. SD cards come in varying capacities, up to 2GB for standard SD (the standard for SD covers up to 4GB, but 4GB SD cards are like rocking horse poo - most 4GB cards out there are SDHC), up to 64GB currently for SD HC (High Capacity).
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