SDHC 8GB SDHC cards 8GB SDHC cards An extension of the SD standard, SDHC (Secure Digital High Capacity, SD 2.0), allows capacities in excess of 2 GB. SDHC cards are often formatted with the FAT32 file system, which supports partition sizes greater than 2 GB.[12] It uses the same form factor as SD, but the SD 2.0 standard in SDHC uses a different memory addressing method (sector addressing vs byte addressing), thus theoretically reaching a maximum capacity of up to 2048GB. SDHC cards only work in SDHC compatible devices, but standard SD cards work in both SD and SDHC devices. The SDHC trademark is licensed to ensure compatibility.[13] SDHC cards have SD Speed Class Ratings defined by the SD Association. The SD Speed Class Ratings specify the following minimum sustained write speed on to empty SDHC cards: * Class 2: 2 MB/s * Class 4: 4 MB/s * Class 6: 6 MB/s