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    Regarding H2testw being Windows-only: I once ran it on OS X using Wine, and successfully used it to confirm that a microSD card I had bought was misreporting its capacity.

    Next time I will try F3. It doesn’t actually look any easier to use or install than H2testw, which has a GUI and is easier to find a download link for, but it is open-source and probably a little quicker to launch.