I just went in and checked a memory card that I used new years eve and than formatted with the menu format option after I down loaded the images. I used Sandisk Pro Recovery program for the check and determined that all of the image files are still there. Only the file names have been removed. This is the same as a quick format on your computer where the FAT tables are cleared. This makes sense in that it takes less than a second to do the format in the camera. What that will do is let you load new images from bit zero with no gaps.