I meant to post this here but accidentally posted it in the equipment advice and reviews section (Mods, do you want to take that other one down?) Ok, so I just got into doing digital photography and haven't had a problem until now! I have a 4 GB Hitachi Microdrive card for my Canon 20D. I was at a shoot the other day when I tried to take a look at the pictures to show my client and all of a sudden there was an error message. And the last few pictures I had taken were missing. However, everything else way before the error message was still there when I got home to put it on my computer (THANK GOD!) I ended up just switching to my back up memory card. Can anyone please help me figure out what to do about this? I spent a good amount of money on this card and I don't know if I could find the receipt (or if they would even take it back at this point since it's been a few months). I have a photo shoot today and it looks like I have to use the back up card and that freaks me out!