FAT File System Research Articles

Design of Data Acquisition Terminal Based on the FAT32 File System

To meet the requirement of data acquisition for some processing equipment on the wooden door production line, this paper proposes a design scheme for a data acquisition terminal based on the FAT32 file system. The terminal uses microprocessor STM32MP157 as the core, SD card as the storage medium, and transplants FAT32 file system to manage data. Based on the analysis of the principle of the FAT32 file system, this paper improved the application and recycling of clusters to slow down the frequent wear of FAT and FSinfo sectors, and improved the data storage speed. The test results show that the system is stable and reliable, and can be used in large-capacity data storage.

Shape and Measurement Monitoring of Inrush Current Characteristics of a Battery-Capacitive Energy Storage Device with Two-Channel Digital Oscilloscope

The main reason of voltage instability in stand-alone power supply systems is the electric drive motors inrush current, which are usually higher than their nominal value. The most reasonable way to solve this problem is using capacitive energy storage. The purpose of research is shape and measurement monitoring of battery-capacitive energy storage device inrush current characteristics. Parameters comparative analysis for lithium-ion battery (LIB) part and capacitive part of the energy storage device was holding with the twochannel digital oscilloscope.Measuring testing bench included parallel connected LIB part and capacitive part of the storage device and connected to the power source. The LIB part of the storage device is made on the basis of the ATOM 10 multifunctional motor drive device of the new generation, which contains 15 V lithium-ion battery and 9.4 A·h capacity. The capacitive part of the storage device is the INSPECTOR Booster supercapacitor with an 80 F electrostatic capacitance and 15.5 V voltage. A 12 V AC/DC step-down converter was used as a power source. An electric air automobile compressor M-14001 was used as a current drain. The testing bench measuring part consisted of a two-channel digital oscilloscope and two standard measuring shunts with 15000 μOm resistance serial attached to LIB part and capacitive part of the storage device. Shape and measurement monitoring of inrush current characteristics of LIB part and capacitive part of the energy storage device was held synchronously using a two-channel digital oscilloscope with recording data to FAT32 file system USB flash drive. Obtained data was transferred to a personal computer and analyzed.The measurement results showed that 82.3 % of the energy losses compensation of the motor start is taken over by the capacitive part of the energy storage device, what makes longer LIB’s life. By adjusting the oscilloscope sweep trace index you can analyze more detailed time response shape and its duration. The values of the inrush current amplitudes were calculated in proportion to the voltage drop on the shunts and their resistances.The developed method for monitoring shape and measurement inrush current characteristics can be used in various technical applications: smart stand-alone photovoltaic system, uninterruptible power supply devices, electric drive control systems, etc.

Forensic analysis of anti-forensic file-wiping tools on Windows.

This paper presents forensic analysis of anti-forensic file-wiping tools on the Windows platform. The goal is to identify and extract the evidence of the tools used to wipe files and the files wiped by them on the Windows operating system. To achieve this goal, we analyzed the changes made by these tools to metadata structures of Windows file systems during file wiping. We also analyzed Registry keys and .lnk files to collect the evidence. Our experiments used four file-wiping tools (SecureDelete v1.0, Secure Eraser v5.2, PC Shredder v1.1, and Blank and Secure v5.88) to wipe files on three Windows file systems (FAT32, exFAT and NTFS). The results suggest that FAT32 and exFAT file system directory structures and $MFT entries of NTFS file system can confirm the use of wiping tools, identify these tools and provide the remnants of the wiped files. Also, $LogFile and $UsnJrnl files of NTFS file system, and Windows Registry keys provide detailed evidence of wiping tools used and the files wiped by them. We also found that the contents of resident and non-resident alternate data streams, $LogFile and $UsnJrnl files, and Windows Registry keys are not wiped by these tools. Finally, this study makes many recommendations, highlights the limitations of the work and points out the future scope.

Investigation of the computational complexity of methods for hiding information in cluster steganosystems

Several methods of technical steganography are currently known. Hiding information in a model in 3D printing, this industry of hiding information has certain advantages and disadvantages, namely: the relatively high cost of creating a hidden message and the difficulty in reading the information. The second area of technical steganography is related to network traffic. In this method, information can be hidden, for example, in the header fields of protocols, or, for example, the transmission of a hidden message by sending packets in a certain sequence. There are also methods of hiding information in the structure of the file system, but the known methods are either capable of hiding a small amount of information, or have an insufficient level of resistance to detection. Thus, an urgent task is to develop a method for hiding information, which is able to hide more information and has a higher level of resistance to detection, with a satisfactory level of computational complexity.
 This paper presents methods of technical steganography based on the structural features of file systems in storage media, in particular, hiding information in the FAT file system by mixing clusters of certain key files (cover files). Methods of hiding information in the structure of a clustered file system by mixing clusters of cover files require significant computational resources. In this paper, research has been carried out on methods to increase computational efficiency in terms of the amount of required RAM, and the number of the required number of basic operations to hide a message.

Automatic reconstruction of deleted AVI video files composed of scattered and corrupted fragments

Video files of surveillance cameras frequently play a role of major evidence for criminals or accidents. But, if the video file containing the evidence is deleted, we need to recover it if possible. In this paper, we propose a recovery scheme for deleted video files with AVI format on FAT32 file system. The proposed scheme first recovers deleted video files from unallocated storage space exploiting both signatures of video frames and behaviours of file systems. The scheme finds fragments of deleted video files based on the start indicator of video frames or the file header signature, and connects the found fragments based on the file allocation patterns of FAT32 file system. Next, if a recovered video file is partially corrupted, the scheme automatically reconstructs the corrupted AVI video file so that the video file can be played back. The lost file header of the corrupted video file is reconstructed based on the file header of a reference video file, and the lost data multimedia data is filled with zero. Through practical implementation, we show that the proposed scheme recovers deleted video files from unallocated storage space and reconstructs corrupted AVI video files.

Extraction of Creation-Time for Recovered Files on Windows FAT32 File System

In this article, we propose a creation order reconstruction method of deleted files for the FAT32 file system with Windows operating systems. Creation order of files is established using a correlation between storage locations of the files and their directory entry locations. This method can be utilized to derive the creation-time bound of files recovered without the creation-time information. In this article, we first examine the file allocation behavior of Windows FAT32 file system. Next, based on the examined behavior, we propose a novel method that finds the creation order of deleted files after being recovered without the creation-time information. Due to complex behaviors of Windows FAT32 file system, the method may find multiple creation orders although the actual creation order is unique. In experiments with a commercial device, we confirm that the actual creation order of each recovered file belongs to one of the creation orders found by the method.

A formal model for event reconstruction in digital forensic investigation

Event reconstruction is an important phase in digital forensic investigation, which determines what happened during the incident. The digital investigator uses the findings of this phase to prepare reports for the court. Since the results must be reproducible and verifiable, it is necessary that the event reconstruction methods be rigorous and strict. In order to fulfill the legal requirements, this study proposes an event reconstruction framework which is based on the formal mathematical methods. In particular, it uses the temporal logic model checking that is an automatic verification technique. The idea is that the system under investigation is modeled as a transition system. Then the digital forensic property is specified using the modal μ-calculus. Finally, a model checking algorithm verifies whether the transition system meets the property. In order to demonstrate the proposed formal event reconstruction framework, an abstract model of the FAT file system is presented and some digital forensic properties are formulated. A big problem in model checking is the so-called state space explosion. This study addresses this problem and suggests some solutions to it. Finally, the proposed framework is applied to a case study to demonstrate how some hypotheses can be proved or refuted.

Formalising Filesystems in the ACL2 Theorem Prover: an Application to FAT32

In this work, we present an approach towards constructing executable specifications of existing filesystems and verifying their functional properties in a theorem proving environment. We detail an application of this approach to the FAT32 filesystem. We also detail the methodology used to build up this type of executable specification through a series of models which incrementally add features of the target filesystem. This methodology has the benefit of allowing the verification effort to start from simple models which encapsulate features common to many filesystems and which are thus suitable for reuse.

Design of Interlnk Protocol Packet at Embedded Linux

Aiming at the file transmission problem between electronic controller for an engine and the portable test equipment based on AT91SAM9263 and Linux, the Interlnk/Intersvr software and their communicating protocol are analyzed and studied which used by electronic controller. The message format and communicating process are made clear by putting up protocol analysis environment at laboratory and source code analysis, FAT file system structure and its access methods are studied, and the file transmission function of test equipment has been fulfilled. The results of test indicate that the desired goals have been reached.

The Linux FAT32 allocator and file creation order reconstruction

The allocation algorithm of the Linux FAT32 file system driver positions files on disk in such a way that their relative positions reveal information on the order in which these files have been created. This provides an opportunity to enrich information from (carved) file fragments with time information, even when such file fragments lack the file system metadata in which time-related information is usually to be found.Through source code analysis and experiments the behaviour of the Linux FAT allocator is examined. How an understanding of this allocator can be applied in practice is demonstrated with a case study involving a TomTom GPS car navigation device. In this case, time information played a crucial role. Large amounts of location records could be carved from this device's flash storage, yielding insight into the locations the device has visited—yet the carved records themselves offered no information on when the device had been at the locations. Still, bounds on the records' time of creation could be inferred when making use of filesystem timestamps related to neighbouring on-disk positions.Finally, we perform experiments which contrast the Linux behaviour with that of Windows 7. We show that the latter differs subtly, breaking the strong relation between creation order and position.

Methodologies for Geotagging in FAT and ExFAT File Systems for Smart Phones

Methodologies for Geotagging in FAT and ExFAT File Systems for Smart Phones

리눅스 환경에서 임베디드 시스템을 위한 플래시 파일 시스템의 성능 비교 분석

Recently the operating system share of linux on embedded system is increasing. The embedded systems on linux environment, commonly equip a file system as mini hard disk or flash memory to keep data. The types of the file system of the system are various according to it's operating system. Anyway, the more embedded system depends on the file system, the selection of the type of the file system effects more on the performance of the system. This thesis performs the performance benchmark of a FAT and Ext file systems which are most popular in embedded system. As the result, it is discussed that what file system is better at which case. These results will be a index at the selection of flash file system of the embedded systems on linux environment.

이동식 저장 매체의 신뢰성 향상을 위한 FAT 파일 시스템의 저널링 방법

이동식 저장 매체의 신뢰성 향상을 위한 FAT 파일 시스템의 저널링 방법

Development of HTTP Server for Remote Data Monitoring and Recording System

This paper focuses on development of remote data monitoring and recording system in industries. Now a days we are using many Networked embedded systems for monitoring and control the home or industrial devices.These low cost devices are capable of reporting and receiving information in just the same way that computers on a network. The advent of Internet communication standard, TCP/IP, offers significant potential in terms of remote monitoring and management of construction sites using embedded systems. In this paper the design method of low cost system of remote data monitoring, and recording is designed based on ARM. For this a small HTTP SERVER is built in LPC2148 and it is connected with the remote monitoring terminal through Ethernet. The data can be stored in the SD Card via SPI interface. At the same time, for the sake of the versatility, the FAT file system is built in the SD Card. So, an Ethernet-enabled remote data monitoring system with the ability of data recording is built. This design is having advantage of cost-effective, easily realized, stable and reliable transmission. It can be connected to the INTERNET or LAN through TCP/IP protocol. FreeRTOS is used as an operating system running on ARM processor, an industrial grade RTOS for hard time applications. By this design the data is sent without a PC and system favour’s large scale data acquisition system.

Design of Data Acquisition System for Fiber Optic Gyro Based on the FAT32 File System

Demand for high-speed fiber optic gyroscope data acquisition and real-time record, the design of the SD Card as storage medium to large capacity fiber optic gyro high - speed real - time acquisition and bulk storage systems, The system by applying the sd2.0 protocol and fat32 file systems in the system, enable real - time Data Acquisition of fiber optic gyro and large capacity storage. Experiments have shown that the system properly designed, easy to use, high reliability to meet the actual demand, is of important practical significance.

A Network Disk Device Based on Web Accessing

The future personal and home demand of big data helped fuel an explosion of development in network disk device market. Compared to a traditional USB hard drive, it separated the user from the hard disk, enjoyed the advantage of accessing from anywhere for unspecific user and easy operation and easy expansion. The paper established the remote access to hard drives via browser with Xilinx's XUPV5 LX110T FPGA development board. The system mounted an ATA host controller IP core and connected it to the network with RJ45. By porting PetaLinux operating system to the MicroBlaze embedded processor of FPGA, an independent FAT32 file system module was added, the users could establish the remote access to hard drives with specific CGI programs through the WEB browser. It was tested that Personal/Home Network Disk can meet the standards of basic file operation. DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5472

Applications of a TransFLash in an Embedded System Debugging

In this paper, the hardware and software design for using a TF card in debugging an embedded system are described. The used hardware platform is designed based on a PXA310 application processor. The Android open source operating system is used as the software platform. The design of the connection circuit between the application processor and the TF card is introduced first. Secondly, the design of the TF card driver program and the method for Android system to mount the TF card are described. In designing the TF driver program, an SPI operation mode and FAT32 file system are used. The transplant of the FAT32 file system is presented more detail. Finally, the paper introduced the system debugging and the test results are given for the TF card used in a video data acquisition unit of a video monitoring. It is shown that high speed data exchange and good universal property can be obtained by using a TF card to download a system image during developing and debugging. The TF card used in debugging can be used as a mass storage in the embedded product without the need of changing the design for debugging the system and it is also convenient for a user to upgrade operating system.

Research of Disk Operating Technique in UEFI Shell Environment

This paper describes the theory and method of programming under the environment of UEFI Shell and also introduces the UDK2010.UP4 install and configuration. The program run in UEFI Shell can get EFI Boot Services through the EFI_SYSTEM_TABLE parameter, after this it can operate disk files through Simple File System Protocol and EFI File Protocol. The work in this paper mainly introduces some file operations in UEFI Shell, such as file creating, data access on a FAT file system disk through a UEFI Application (UEFI App hereafter).

An Efficient Design for MP3 Player based on ARM Architecture and Its Application in Education

As MP3 format audio files have many advantages, MP3 players have been widely used in several application fields. However, most of the existing MP3 players are design for general purpose. Therefore, in this paper, we investigate a design scheme of MP3 players which is suitable to be used in education. To make the MP3 player more powerful, we import an ARM architecture based processor in our design. Particularly, an efficient MP3 decoder is proposed to promote the performance of MP3 player. Afterwards, we give a modified embedded FAT32 file system which is composed of three layers and we define a new file information structure to make the MP3 file can be easily retrieved and managed.

MFTL

NAND flash memory has gained its popularity in a variety of applications as a storage medium due to its low power consumption, nonvolatility, high performance, physical stability, and portability. In particular, Multi-Level Cell (MLC) flash memory, which provides a lower cost and higher density solution, has occupied the largest part of NAND flash-memory market share. However, MLC flash memory also introduces new challenges: (1) Pages in a block must be written sequentially. (2) Information to indicate a page being obsoleted cannot be recorded in its spare area due to the limitation on the number of partial programming. Since most of applications access NAND flash memory under FAT file system, this article designs an MLC Flash Translation Layer (MFTL) for flash-memory storage systems which takes constraints of MLC flash memory and access behaviors of FAT file system into consideration. A series of trace-driven simulations was conducted to evaluate the performance of the proposed scheme. Although MFTL is designed for MLC flash memory and FAT file system, it is applicable to SLC flash memory and other file systems as well. Our experiment results show that the proposed MFTL could achieve a good performance for various access patterns even on SLC flash memory.