Transcends standard class 4 cards are and ideal and economical choice for storing digital data with a minimum writing speed of 4mbs and in capacities of 4gb to 16gball sdhc cards are aubject to extensive compatibility and reliability tests and have a gurantee of 30 years each card has an integrated ecc error correction code error correction which detects and removes automatically the errors during data transmission furthermore the card is equipped with wear leveling algorithm for a long