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    Default sd card speed problem

    my galaxy s4 is not from AT&T - its from Bulgaria Globul, but there is no such sub forum because of this I write here. I bought microSDHC card adata premier - Premier microSDHC/SDXC UHS-I Class10_Memory Cards_ADATA Technology this one.
    Here is the speed charts - Charts, benchmarks SD Cards 2014, [2] Sequential Write [MB/s] - its almost 20mb/s.
    My card is much much slower than this. I bought it from very trusted shop in my town so its impossible to be fake. The write speed when I write mp3 files (4mb avg) is 4mb/s when I copy through cable (from pc to the phone's sdcard). When I write directly to the sd card with card reader its 8mb/s. So what happens? Is anybody have the same problem? Is it normal when I use cable the speed to be slower than with card reader. Why the speed is at least 2 times slower than in tests? (the card is formated in fat32).

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