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STM32F103 + AT45DB642 as USB card reader

Question asked by urasinov.iurii on Dec 19, 2012
I have device with STM32F103 and spi flash AT45DB642. STM32 should store logs each hour to spi flash. We decide that that the most userfriendly way to read these logs it's mass storage device. 
When user connects device to PC he should see MSD and txt files inside with logs.
txt files should be visilble inside spi flash. 
How to implement it? Maybe somebody already made same?
Is it necessary file system inside spi flash? What is better solution to solved this task?