Starting at 4GB, SDHC cards offer larger-volume data storage and optimized recording performance with support for FAT 32 file formats. Although identical in size to today's standard SD card, the new SDHC media cards are designed differently and are only recognized by SDHC host devices. To ensure compatibility, look for the SDHC logo on cards and host devices (cameras, camcorders, etc.). For added reliability and durability, our solid-state SDHC memory cards are built of nonvolatile memory components and have no moving parts that could wear out or break. All cards are 100-percent tested and are backed by a lifetime warranty and free live technical support. High-Speed Class Rating Class 4 at a minimum data transfer rate of 4 MB/sec . Compatible with SDHC host devices, not compatible with standard SD-enabled devices/readers.