
So slow. I was able to achieve write speeds of around 4.5 MB/s via a USB 3.0 port on a laptop with a Core i7 processor (Thinkpad T460p). We don't read much better. More than 3 times slower than the old micro SD/SD reader they had to replace. I will be returning one of the two batches I purchased and will get a proprietary reader instead.

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