MicroSD is a smaller variant of the SD (Secure Digital) card and is used in certain cell phones, PDAs and smaller, lighter devices. MicroSD cards can be read by regular SD card slots through an adaptor.
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"MicroSD vs SD Card." Diffen.com. Diffen LLC, n.d. Web. 25 Jul 2014. < http://www.diffen.com/difference/MicroSD_vs_SD_Card >