a.) DM-9 Data Memory Back DM-9 can store up to 18 items of photographic data from each of 400 rolls of 36 exposure film on SmartMedia, and offers data imprinting on the outside of the film frame. b.) QD-9 Maxxum Quartz Data Back 9 lets you imprint the date or time on your pictures. It gives you the choice of printing the data as day/month/year, month/day/year or year/month/day. You can also print the time of exposure in 24-hour time format. Data imprinting may also be turned off if you wish.