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When I was doing more testing on µSD cards and their small block speeds, SanDisk and Samsung were consistently the best performers. One sad case was a class 10 32GB Patriot card where the small block write speeds were ~15KB per second compared to 32GB SanDisk and 32GB Samsung cards where the small block write speeds were in the 1-2MB per second range.
The two attached images are for two 32GB µSD cards. A SanDisk which shows as 29GB and a Samsung which shows as 30GB. Both cards are class U-1 (50MB/S).
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