Sony offers three class memory cards: high performance, value-added, and entry-level class which are support AVCHD and MP4 format for you who demand class-leading capacity and transfer speed. According to Sony, the cards are the perfect partner for your Sony’s cameras and camcorders from casual photography to the most data-intensive imaging applications.
In addition, the high performance class(class 10) SDHC cards features up to 22MB/s transfer rate;available in three size storage:8GB, 16GB, and 32GB. it’s the fasters SDHC card among others two. And the value-added class(class 4) is available in 5 size storage:2GB, 4GB, 8GB, 16GB, and 32GB with up to 15MB/s transfer rate. Meanwhile the slowest version is available in 3 size:2GB, 4GB, and 8GB. Both value and entry class are available in both SD and SDHC.