When I put a formatted SD card in my E-P2, the display shows a capacity of RAW files that doesn appear to be accurate. Why?
When the E-P2 writes a RAW image file, it performs complex mathematical calculations to convert it to binary data to be saved and later retrieved. Since images are unique, each calculation is unique. A RAW file recorded by the E-P2 will be approximately 14 megabytes, but individual file sizes will vary. For example, a winter landscape consisting predominantly of white snow and blue sky will produce a smaller data file than a scene such as Times Square at night. The richness of the latter scene will result in a larger file. When the camera polls a formatted SD card, it is looking at a blank slate. It has yet to do the math for any images and is programmed to start out with a conservative capacity estimate. As the camera shoots more images, it recalculates the capacity as it learns about the image files it is creating. As the card fills up, the estimated capacity of RAW files on the display will become more accurate.
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