Good but misleading speed SD card

Good but misleading speed SD card

MicroSDXC memory card SanDisk Mobile Ultra 128GB Class 10 UHS-I with a read speed up to 30MB / s + SD Card Adapter + Memory Zone Android app (SDSDQUA-128G-U46A) (Personal Computers)
Buy at Amazon.com

Customer Review

SD card purchased for my tab S, no Difficulty: recognized card. No problem either when the logs on a PC. The price is right.

But! The SD card does not correspond at all to an SD card class 10, the posted speed read / transfer is well below that announced (30 mb / s): in reality between 6 and 7 mb / s.
The description is misleading!

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