Most of the cameras utilize some form of removable storage to store data. While the vast majority of the media types are some form of flash memory (CompactFlash, SD, etc.) there are storage methods that use other technologies such as Microdrives (very small hard disk drives), CD single (185 MB), and 3.5″ floppy disks.
Although JPEG is the most common method of compressing image date, there are other methods such as TIFF and RAW (the latter being highly non-standardized across brands and even models of a brand). Most cameras include Exif data that provides metadata about the picture. Such Exif data include aperture, exposure time, focal length, date & time taken, and camera model. -Wikipedia
