Today's pro-sumer digital cameras, such as the Canon S1iS, can take huge capacicy CompactFlash memory cards. One owner, however, was discourged to find that his camera seems to only access half of the newly-purchased 4GB memory card. After formatting for card in his camera, rgorcomplained, "The camera tells me I have 1.9gb available space."
Aaron quickly provided the solution: "Do you have a switch on the card?
* 1 position for 4GB
* 1 position for 2 GB
* And the other for the other 2 GB"
The tiny switch on the SanDisk 4GB UltraII CF card allows it to be used with cameras that cannot access more than 2GB of RAM. Rgor checked, and found that the switch was in the 2GB position. Changing it to the 4GB position solved the problem.