SDHC host devices only accept the older SD cards. The 2.0 version introduces the high-speed bus mode for both SDHC and SDSC. The SDHC trademark license is to ensure compatibility. It is defined in SD specification 2.0 version to support cards with 32 GiB (34,359,738,368 bytes) capacity at most. SDHC: The Secure Digital High Capacity (SDHC) format was released in January 2006.The Secure Digital changes the design of MMC in multiple ways from shape, thickness, capacity, transfer speed to content protection. SD: The second generation of Secure Digital (SDSC or Secure Digital Standard Capacity) cards was developed to improve the MultiMediaCard (MMC) standard, which keeps improving but in different directions.Next, I will explain them briefly one by one. They have different features but with the same function – data storage. SD, SDHC, SDXC, SDUC are four primary card categories in the market.
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