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The format [SD card] has proven to be very popular. A change in the established format, however, while allowing capacities greater than 4 GB (SDHC), has created compatibility issues with older devices that cannot read the new format. The fact that SDHC format cards have the same physical shape and form factor as the older format has caused considerable confusion for consumers. SDHC cards require SDHC-capable device firmware generally not found with older devices.