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Regarding SD flash memory cards, SD stands for Secure Digital. Do SD cards or any of its variants (SDHC, SDXC) have any particular security features compared to other types of flash memory cards such as Compact Flash or Memory Stick?

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No, there are no additional security features on these disks than on any other flash type of media. See en.wikipedia.org/wiki/Secure_digital for details about the type of media. –  MaQleod Sep 3 '11 at 1:41

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