Safe FAT File System

Overview

In the embedded industry FAT file systems are commonly used on removable memory that needs to be read by/written to by a PC. However typical FAT (File Allocation Table) file system implementations have inherent weaknesses which can lead to file and directory corruption if the system is interrupted during a write routine. When you open a file to modify it, the normal FAT process overwrites the existing data. If the system were to reset during that process a portion of the file would have been changed before a new image was built.

RTXCfatfile-safe is a PC-compatible file system that includes a journaling system to guarantee that all file system operations will be carried out in a failsafe manner. If the system resets or loses power unexpectedly, it will return to a coherent, consistent and usable state.  The original file remains unchanged until either a file flush or file close is called. At that point the system performs an atomic switch of the file state and the new data become valid.

Features

• FAT12, FAT16 and FAT32
• Long filenames
• Multiple volumes
• Mix of media types
• Unicode16 support
• Media error handling
• PC compatible
• Multiple open files for reading/writing
• Multiple simultaneous users of open files
• ANSI C compliant C source
• Standard API (fopen, fclose, fwrite, etc.)
• Efficient zero-copy read/write
• Caching options
• CheckDisk utility
• Detailed user guide