I have just returned from my holidays to the Red Sea in Egypt. http://www.play.com/play247.asp?pa=sr&page=title&r=ELEC&title=502803 I was given 2x512meg SD memory cards (High Speed) from two good friends as a birthday present to use with my Canon digital ixus 700. Both cards produced memory errors and were unusable once a good few pictures were taken (approx 20% of card). I also have a Sandisc SD 1 gig card which I had no problems with at all. To say I am annoyed at this is an understatement as I took both these cards on a dive to the Red Sea and chance had it I saw a 12 foot Hammerhead shark . Try as I might the card I was using wouldn't let me take a picture. I instead it kept saying 'Memory Card Error' or 'unreconised format'. Even though I had been snapping away with the camera all morning and rewatching short video and pics, with no problems. This was the same for both play.com memory cards. In the end I had to resort to backing up my Sandisc card on cd by a small photoshop I found in the hotel. Has anyone else had any problems with these cards?