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STM32F7 Discovery USB Hi Speed too slow

Question asked by FH-Kiel on May 18, 2016
Latest reply on May 18, 2016 by Clive One

we are working on an USB Hi Speed Project with a STM32F7 Discovery. We compiled and flashed the demo Mass Stoarge Device application (from Cube) and inserted a CLASS 10 Micro SD Card in the Discovery Board. We tested the data rate, but we are not able to get over 378kByte/s write and 1,47MByte/s read. We also tested the same Micro SD Card with our Mobile Phone at the same USB Port and we easily reached higher transfer rates.

Does anyone have an idea what we do wrong?

Best regards