Similarly to the above, as of version 2.00 of the specification,[23] the capacity of an SDHC card is limited to 32 GB. However, while not strictly adhering to that standard, it is in principle possible to create SDHC-like cards of up to 2 TB capacity. Some SDHC devices will accept SDXC cards with capacities greater than 32GB and recognize the full capacity, however compatibility is not guaranteed in all cases. SDHC cards have a fixed sector size of 512 bytes.
QUOTESDHC (Secure Digital High Capacity, SD 2.0) is an extension of the SD standard which increases card's storage capacity up to 32 GB. SDHC cards share the same physical and electrical form factor as older (SD 1.x) cards, allowing SDHC-devices to support both newer SDHC cards and older SD-cards. To increase addressable storage, SDHC uses sector addressing instead of byte addressing as in the previous SD standard. Byte addressing supported card capacities up to 4 GB, whereas sector addressing can theoretically support capacities up to 2 TB (2048 GB). The current standard limits the maximum capacity of an SDHC card to 32 GB[24] (it is expected that the SDHC specification will be revised in the future to allow card capacities greater than 32 GB[12]). SDHC cards will not work in devices designed to the older SD 1.x specification. The SDHC trademark is licensed to ensure compatibility.[25]