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All cards are not created equal, and some that state storage space are lying. Before using any new card delete anything that may have been hidden on it and format using standard format, not fast or quick format.
If you've been using a card for awhile and have cut or deleted lots of stuff previously, re-format to clean and format the file space.
Lots of great responses. I had a similar problem. Shot only several minutes of video and the it said the card was full. Turned out the SD card even though a Sandisk which I use all the time was not one made for videos and photography.... Switched to one of my other SD cards and everything is fine...