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MicroSD card buying guide 2017: Understanding microSD card speeds, Formats, and Types - Smartprix Bytes
Lexar 128GB microSDXC UHS-I Micro SD Card Class 10 U1 Speed up to 80MB/s £13.95 - Free Delivery | MyMemory
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Markings: speed, size and class | Understanding microSD and SD cards: speeds, markings and more | Adafruit Learning System
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