Samsung MB-MG8GB, 8 GB, MicroSDHC, Class 10, 70 MB/s, 20 MB/s, Black Samsung MB-MG8GB. Capacity: 8 GB, Flash card type: MicroSDHC, Flash memory class: Class 10, Read speed: 70 MB/s, Write speed: 20 MB/s. Product colour: Black SD and MicroSD have the most popular type of memory card for some time. People use them for digital cameras, smartphones, tablets and other portable devices that require storage. There's a huge number of them on the market, and not all of them are equal... SD and MicroSD have the most popular type of memory card for some time. People use them for digital cameras, smartphones, tablets and other portable devices that require storage. There's a huge number of them on the market, and not all of them are equal...