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What are SDHC cards?

SDHC (Secure Digital High-Capacity) cards are flash memory cards with a minimum capacity of 4GB. SDHC cards provide removable memory for compatible digital devices including: cameras, camcorders, PDAs, MP3 players and more, because these items often require higher memory capacity. Secure Digital refers to a specific format within the flash card market. SDHC cards are designed for devices that are compatible with the SDHC 2.00 specification. Products designed exclusively to support previous SD specifications 1.0 and 1.1 will not be able to utilize SDHC cards. Basically, the older generation of SD cards can only hold up to 2GB of memory. But SDHC cards are not backwards compatible and will not work on SD devices.

The different classes offer different transfer speeds (DTS):
  • Class 2: minimum sustained DTS of 2MB/sec
  • Class 4: minimum sustained DTS of 4MB/sec
  • Class 6: minimum sustained DTS of 6MB/sec


    • There is also 150X. This is reading speed and it means that the card will read data at 150X the standard speed of 150 kilobytes/second. The bottom line is that it will read data at a much faster speed than standard cards and Class 6. The technical stuff:

    SDHC is essentially the next generation of SD cards. SDHC cards have the FAT32 file system integrated into their technology, which allows the SDHC cards to reach capacities up to 32GB.

    Future:
    Now companies are unveiling new cards as high as Class 10, but they are not as yet readily available to the public. The next generation, called Secure Digital Extended Capacity (SDXC), which can reach capacities up to 2TB have been unveiled but not yet released to the public.



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