Tested write a 1GB file (containing MP3 files). Respect minimum flow in class writing 4: 4.75 MB / s. For me (not beyond), with a 4.65 ralentissment constant during the last 30 seconds. (3 min 51 sec.) Reading 1 fast file; less than the 2nd. Having performed a test on a single type of file; and in view of what could presage slowdowns observed in the 1st & only use, added to the fact that if the minimum flow is assured, you're in nearly as much as he will never frankly exceeded, I just give this article the "upper middle" (3 stars) Nes: actual capacity: 14.6 GB.