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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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Amazon.com: SanDisk 1TB Extreme microSDXC UHS-I Memory Card with Adapter - Up to 160MB/s, C10, U3, V30, 4K, A2, Micro SD - SDSQXA1-1T00-GN6MA : Electronics
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