STM32F1+USB+SDCard+MSC

I work at implementation of USB Mass Storage Class witch SD card on STM32 microcontrollers.
I use RL-ARM USB library. In my implementation I use Keil example of Mass Storge Class but this example write data in internal RAM. It is to small memory for my application. I need use SD CARD to storage data. If anyone have example i will by grateful.

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