Flash memory is a nonvolatile memory, that data is not lost power. Because flash memory like RAM (random access memory) as rewrite data, in bytes, so can not replace the RAM.
Flash Cards is the use of flash memory technology to achieve storage of electronic information storage, generally used in digital cameras, PDAs, MP3 and other digital products as a small storage medium, so look small, like a card, so called flash memory card.
According to different manufacturers and different applications, flash memory cards about SmartMedia (SM Card), Compact Flash (CF Card), MultiMediaCard (MMC Card), Secure Digital (SD Card), Memory Stick ,XD-Picture Card (XD Card) and Microdrive Although the appearance of these flash memory cards, different specifications, but the principle is the same technology.
NAND-type flash memory of the operation efficiency is low, it and its architecture design and interface design-related, it does operate quite like the hard disk (in fact the beginning of NAND-type flash memory is indeed considered in the design compatibility with the hard drive), and its performance characteristics also like the hard disk: small data block operation is very slow, and large blocks of data speed quickly, this difference is larger than many other storage media. The performance characteristics are worthy of our attention.
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