The 64GB SDXC Memory Card Extreme Class 10 from SanDisk is a high-performance memory card. It improves upon the previous version's 30 MB/s max read / write speed by offering faster 45 MB/s performance. Minimum write speed is still 10 MB/s. These data rates get you ready for the next shot faster, and cut down on wait time when you're transferring your work from card to PC. The large 64 GB memory provides ample storage space. Designed with the HD Video shooter in mind, this card won't give you lag time in between video clips, even at the highest resolution.