When we take pictures, the Canon cameras we use take SDHC Memory cards. Everyone knows the cards come in different sizes, from 2GB up to 32GB, but many people do not realize that the cards write pictures at different speeds.
When you look at a SDHC card there is a number in a circle located on the front of the card which lets you know what class the card writes at. The classes run from 2 to 10. 2 being the slowest class and 10 being the Fastest. We take many photos during an event and find that we need class 10 cards to keep up with the speed at which we take photos. The Card which performed the best for us during the Military Challenge event was a Transcend 16GB Class 10 card. The camera did not freeze up or slow down using the card, and the transcend cards are being sold at a great price. Check them out and always check the Class of the card when buying your next memory card.