In a fit of recklessness, I bought a 512 MB CF card on Ebay, $211.00 + 7.00 shipping. It is made by the giant in memory manufacturing... RAM STAR. I've never heard of them, but it has performed flawlessly in my D100. I also bought a Mindstor 10gb at Fry's. I go back and forth to various countries in Africa. Laptops are considered a threat to national security in some countries, so the Mindstor is the safe alternative. It has worked on 110VAC 220VAC and on three continents. Both the CF card (the really cheap one) and the mindstor have been through all types of x-ray scanners from the latest at Heathrow and and Gatwick to the antique (designed by Madamme Curie herself!) ones in Zambia. They both have been up and down in bush aircraft in Zambia and both just went on a 5,000 mile trip across and back the US in a 1950's warbird (hot, cold, up and down and 30 hours of brutal vibration). So far, neither one has failed me. I supose I could shoot them up in space and see how they do, but I'm not up for it. My experience with electronics is: it works out of the box for the product expected life, or it dies within minutes of purchase. It is kind of like getting a car made on wednesday or one made on friday.