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How to increase write speed with USB High speed host mode with STM32F4?

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Hello, I want to write into a text file in a Flash drive using STM32F405 and via USB HS mode. I have used fatfs library and also Tilen Majerle Libraries for USB HS HOST mode. I succeeded to write to a text file in a 8GB flash memory. But I have two problems here:
1. When I use another flash drive except 8GB, for example 16GB one, it can't write to flash and an error occurs in mounting stage.
2. Maximum speed that I have reached is 1.3MB/s. I want to increase this speed, how can I do this? Does anybody have any document for using USB HS in STM32?
 

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