Well, I had no idea how much room a 1 MP picture would take up on a CF card. I know it is a combination of compression and format, but I never really did the math. GREAT PRICE: I bought this card, number one, because the price was great. Now the price is even greater when you get it for about 2MB for $1. NUMBER OF PICTURES THAT CAN BE STORED: 155 in a DC240 with 1MP. 55 in a DX3900 with 3.1 MP. I never knew the MP versus MB formula, this practical application helped me out. I understand however, much depends on your compression and format. This was all .jpg files and on Kodak cameras. SEEMS COMPATIBLE FOR PDA AND PC: I know one of the concerns on these cards is compatibility. Since I have had it, I have put it in an @migo Pocket PC, on the PCMCIA card on an IBM laptop and a Kodak DX3600 and a HP315. It worked great. Nice card and a nice size, I'm set for awhile now.