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Because the Excel file is often edited, the data blocks stored in the hard disk which make up the Excel file is often not continuous. Discontinuous storage fragmented files, deleted or formatted, with the current data recovery software to restore the effect is very poor, often file recovery, but can not open or is garbled. Therefore it makes sense to study an effective recovery method to recover Excel fragmented files. Based on "Laura" file format, first introduced the Windows platform fragmented files, and then given an Excel file fragmentation recognition method, final based on debris identify given Excel file fragmentation restructuring.

Based on the analysis of the structure of the 3DS file, this paper uses recursive method to collect content of 3DS file and designs the data structure to save them. Then, reading and drawing principle for 3DS file is studied by DirectX 11. Finally, the system for reading and drawing 3DS file is designed and implemented based on DirectX11 in VS2010, and achieves better results.

This paper discusses about types of file structures in Linux, points out that EXT2 is the most commonly used file system in Linux, analyzes the disk layout, index point and directory structure of EXT2, and studies the method to access files in EXT2 by name, which makes the access faster and more efficient.

ARM is the newest 32-bite RISC microprocessor. Its high performance, low power consumption and flexible extension make ARM particularly suitable for designing embedded system. Therefore, the realization of the FAT16 file system with ARM can satisfy the demand of file storage in embedded system. This article descripts the simple realization of FAT16 file system with ARM 7.