Petit FatFs Limitations

Petit FatFs specifically use as little Flash and stack as possible. This, however, comes at the expense of some functionality. Files cannot be created or increased in size, and only one file can be accessed at a time. The mode of sector access is limited in terms of efficiency, and therefore there are significant periods where the SDC/MMC is busy. This busy period occurs for every partial sector access operation, so in applications where an entire sector cannot be read or written at once, the maximum access frequency further decreases. For more information, refer to AVR42776.