Starting at 4 GB, SDHC cards offer larger-volume data storage & optimized recording performance with support for FAT 32 file formats. In addition, Kingstons SDHC cards use new speed "class" ratings known as Class 2, 4 & 6 that deliver a minimum data transfer rate for optimum performance with SDHC devices. ¯34;&8226; Although identical in size to todays standard SD card, the new SDHC cards are designed differently & are only recognized by SDHC host devices. To ensure compatibility, look for the SDHC logo on cards & host devices (cameras, camcorders, etc.). ¯34;&8226; For added reliability & durability, our solid-state SDHC memory cards are built of nonvolatile memory components & have no moving parts that could wear out or break. All cards are 100-percent tested & are backed by a lifetime warranty & 24/7 live technical support.