[M] Silicon Power Mobile X31 OTG USB 3.0 Flash Drive Review
 

Silicon Power has recently introduced its lightweight mobile USB 3.0 OTG drive which can be used to transport and transfer data between multiple mobile devices and while its read speeds are pretty good, it falls a bit short on the writes; considering that the Android and Windows tablets which support this function are USB 2.0, the lower write speeds should not be such a bit inconvenience, but when copying data from our PCs to the drive, we can see it lagging a bit.

http://www.madshrimps.be/articles/article/1000704/