Hello @mounika and welcome to the Community :),
The FatFs_uSD example is available in STM32CubeF7 package.
This application provides a description on how to use STM32Cube™ firmware with FatFs middleware component as a generic FAT file system module using STM32F769I-EVAL. The objective is to develop an application making the most of the features offered by FatFs to configure a microSD drive.
I think also this article: How do I Create a File System on a SD card using STM32CubeIDE? can help you.
Thank you.
Kaouthar
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