The images saved by the camera are encoded as "TC0nnnnn.JPG, where nnnnn is replaced with a 5 digit numeric index, or Next Image Index. If the Next Image Index value is 213, the next image file saved will have the file name TC000213.JPG. The index is only loaded on power up, so changes to this number will not be seen until the next power cycle. It is wise to clear older images from the camera when the Index is set to a smaller value, to prevent overwriting existing data.

When the FAT32 Image storage partition is reformatted, the image index is automatically set to 1.