Two formerly reserved bits are used to indicate card type to the host, with standard SD cards using a value of 0, with a 1 indicating SDHC format (or later, SDXC). Sharp readers will note that ...

In the years since then there have been a couple of revisions to the standard, SDHC, and SDXC, which have given us the huge cards we are used to today. Many other devices from the 2Gb SD era ...