Quote:
Originally Posted by inkista
SDHC and CF both have the same theoretical upper-limit (via FAT32 addressing): 2TB
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The SDHC specification (SD 2.00) only allows up to 32 GB. A new specification will be needed for more than that. Presumably such a specification would be incompatible with current SDHC equipment (as SDHC is incompatible with older SD equipment).
The CF hardware interface is based on parallel ATA, and so is only able to address up to 128 GB. Some sources call the limit 137 GB, but that's based on decimal G rather than binary G… hard drives are typically rated in decimal G, while CF cards are typically rated in binary G (or we'd have 17 GB cards). A new "CFast"
specification based on serial ATA (SATA) is in the works, but it is incompatible with current CF equipment.