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SD and SDHC differ in some material ways. SD uses byte-level addressing and is limited to a size of 2 GB. (The spec could theoretically support 4 GB, but is limited by spec to half that, possibly as a hedge against implementation errors.) SDHC uses sector-level addressing, lifting that limit to a theoretical 2 TB.

SDHC and SDXC are identical at a protocol level.

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