Despite using the UHS-I specification that is limited to 104 MB/s, SanDisk's new cards boast 200 MB/s speeds. But how?
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SanDisk 64GB Extreme microSDXC UHS-I Memory Card with Adapter - Up to 160MB/s, C10, U3, V30, 4K, A2, Micro SD - SDSQXA2-064G-GN6MA : Electronics
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You might be using the wrong microSD cards