They work like floppy disks, but also contain components of flash drives that allow them to store data based on electronic binary pathways. SD cards started as a remnant of the long retired floppy disk, but have now become a very popular and efficient means of storing data, especially for portable devices. While SDSC (SD Standard Capacity) cards store up to 4 GB, there are also SDHC (SD High Capacity) and SDXC (SD eXtended Capacity) versions that store up to 32 GB and 2 TB respectively. They can also be used with both desktop and laptop computers if the user purchases an SD card adapter. SD cards are very small and fit in many portable devices such as cameras, video game consoles, and cell phones. An SD (Secure Digital) card is a portable storage device that stores data even when it is not powered.
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