Testing (continued):

CrystalDiskMark 3.0.1:

512K Read...



512K Write...



4K Read...



4K Write...



As you can see the Kingston 128GB SDXC has a sequential write speed of 14MB/s, 40% higher than the Class 10 minimum of 10MB/s. Real world results revealed even better results - with a 1GB compressed file taking 68 seconds to write (approx 16MB/s write) and taking 24 seconds to read (approx. 41MB/s). As expected smaller file sizes take a larger penalty hit - SSD flash memory reacts the same way to smaller file transfers.