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CompactFlash is a name of a standard used for a mass storage device, which is mostly used in digital cameras. Today, most CompactFlah devices use flash memory. Since most CompactFlash cards have no movable parts, they are also used in embedded systems. Compact flash cards are 36.4mm by 42.8mm in size, and either 3.3mm or 5mm thick. The 3.3mm type is known as Type I, the 5mm type is known as Type II. Most type II devices are small hard disks. The transfer speed is often given as an x rating, where the base is 150kB/s for 1x speed, which was also the base speed for reading compact discs.
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