Micro SD cards are one of the smallest removable flash memory card formats designed specifically for small devices, mainly used as phone memory cheap sd cards. Smaller than mini cards, and also based on the SD card format, micro 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 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.

A Micro SD card’s speed is measured by how quickly information can be read from, or written to, the card. It can store higher definition of videos, higher resolution of photos and you don’t have to worry about losing your precious data. In applications that require sustained write throughput, such as video recording, the device might not perform satisfactorily if the card’s class rating falls below a particular speed.

In early cards, the speed was measured with the “×” rating, which compared the average speed of reading data to that of the original CD-ROM drive. Currently, the official unit of measurement is the Speed Class Rating, which guarantees a minimum rate at which data can be written to the card.