[Q] Slow copying to micro sd card

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http://forum.xda-developers.com – I am using V30B Pure Repack by N00B and just bought a new micro sd card of kingston 16GB class 10. I put the card into the phone, then connect the phone to PC via USB. I use mass storage mode. Then when I start copying file from PC to my phone, the speed only is 2MB/s write. I wonder if it is a bad card. I also did a benchmark and still got about 2MB/s write. I googled and had no clue. (HowTos)