Hector has a Sandisk 64GB SD card from Best Buy, and now he's getting error messages due to "insufficient write speed." Is there something wrong with his camera? Leo says that most SD cards today can keep up with the cameras they are used in. You need a class 4 card for the Vixia Camcorder, and Hector's is a class 10. So it's plenty fast. But it could be that the card is wearing out after steady use and it's starting to fail. When you start getting errors like that, you're living on borrowed time. So it's time to get a new card.