"It's 16MB of uncompressed flash memory, four times bigger than the Memory Card 251 and thirty-two times bigger than the Memory Card 59. (Wondering where the weird numbers come from? The file format data is five blocks, and that size is constant regardless of the card's total size. So add five to each of the capacities, and you'll get powers of two, which are very common when dealing with memory."
sorry for forgeting the quote.