Micro SD cards are one of the smallest removable flash memory card formats designed specifically for small devices, mainly used as phone memory. Smaller than miniSD cards, and also based on the SD card format, microSD memory cards measure roughly 15mm x 11mm in size - about the size of a little finger fingernail.Older devices support only Micro SD cards while the latest devices support both Micro SD cards and Micro SDHC cards.
Micro SD cards can also be used in SD-compatible devices via an SD adapter. Micro SD cards are becoming increasingly popular because they are so small and slim and mobile phones and the minute MP4 video players are increasingly using this innovative space saving technology.
Speeds
A Micro SD card's speed is measured by how quickly information can be read from, or written to, the card. In applications that require sustained write throughput, such as video recording, the device might not perform satisfactorily if the SD card's class rating falls below a particular speed.
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