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According to Samsung's page on this camera, the following memory can be used:
External Memory(Optional) : Micro SD (up to 4GB) Micro SDHC (up to 8GB)
4 GB is acceptable, but I think you do not have the correct type of card. You should be using a Micro SD or "Micro Secure Digital" (up to 4GB capacity) or a Micro SDHC or "Micro Secure Digital High Capacity" (up to 8 GB capacity) card. This is very different from an SD or SDHC card. These Micro cards are very small (smaller than your thumbnail) and are often packaged with an SD adapter card. Regardless if sold with or with out the adapter, the package should say Micro SD or Micro SDHC on it somewhere.
The original Blackjack will not recognize anything larger than 2gb. Sorry, but you just wasted buying those 4 gb. cards. I found this out the hard way too when I bought my daughter a 4gb card for her Blackjack. I have a BJ2 which will recognize the 4gb cards.