15MB / s finishing off misnomer!

In a nutshell, Class 4 symbol is on it, and Class 4 it also creates. no more and no less. For the performance, the price is much too expensive. My ancient SanDisk Ultra II Plus USB 1GB creates loose twice the same card reader ....

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DriveType APPLE SD Card Reader
Disk Test 18:08
Sequential 13.61
Write uncached 12:58 5:49 MB / sec [4K blocks]
Write uncached 12.71 17.05 MB / sec [256K blocks]
Read uncached 9.98 1.57 MB / sec [4K blocks]
Read uncached 28.19 12:16 MB / sec [256K blocks]
Random 26.92
Write uncached 111.29 1.68 MB / sec [4K blocks]
Write uncached 8.69 1.99 MB / sec [256K blocks]
Read uncached 154.85 1:01 MB / sec [4K blocks]
Read uncached 55.41 10.86 MB / sec [256K blocks]