Bit of a problem with the details of this question. The Finepix S7000 does not use CF (Compact Flash) cards- it uses XD cards. I am not sure if the model is wrong in the title to your question or if you have misidentified the card.
In any case, the problem is almost certainly due to the card having too high a memory capacity for your camera to cope with. Memory cards have grown enormously in capacity in the last couple of years, and even relatively new cameras may not be able to cope with the memory size of the newest cards. The higher capacity cards are sometimes slightly altered in the way they work, too, such as the newer SDHC cards which look like SD cards and fit the same slots, but often won't work with older cameras.
It is often difficult to find out the maximum capacity memory card a camera will use, but Fujifilm have a compatibility chart for the S series cameras on their website, at
THIS LINKAccording to this chart, the S7000 will accept an XD card up to 2GB. If that is your camera, that should provide plenty of storage. You can always carry a spare 2GB card if you think you will need more space.