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I am studying the FAT32 manual, now i want to write a program to browse the device. How to read a specific sector of the device, i do not want to load the entire device as a file into memory, please suggest some system call's to get started.

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Find the block device in /dev/, then your system calls are open, lseek, and read. Higher level stuff like fopen, fseek, and fread will work too. Everything is a file.