ExFAT文件系统DBR的分析与重建  

Analysis and Reconstruction for ExFAT File System DBR

作　　者：赵振洲[1] 

机构地区：[1]北京政法职业学院信息技术系,北京100024

出　　处：《计算机技术与发展》2012年第3期85-88,共4页Computer Technology and Development

基　　金：北京市教委优秀青年骨干教师资助项目(KM201010009006)

摘　　要：ExFAT是一个支持更大的存储容量,又具有更快的存取速度的文件系统,特别适合大容量移动存储的需要。随着ExFAT文件系统的广泛应用,其数据安全问题日益突出,尤其是DBR遭到破坏后,整个分区都无法正常访问,给用户的数据安全带来严重的威胁。目前针对ExFAT文件系统的数据恢复软件有R-Studio4.6、D-Recovery For ExFAT,这两款软件能够对ExFAT分区下删除或格式化的文件进行恢复,但都不能保证100%的恢复。而实际上DBR遭到破坏后,只要不点击格式化,就完全没有必要进行数据恢复,只需要通过分析、计算,然后手工重建ExFAT文件系统的DBR即可。文中首先介绍ExFAT文件系统的结构,然后对其DBR进行分析,最后系统介绍DBR手工重建的步骤、参数计算的方法,结合校验值计算函数开发了校验值计算工具,并具体应用到DBR的重建过程中,具有较强的实际应用价值。The file system of ExFAT supports a greater storage capacity,but also has faster access speed,especially for high-capacity mobile storage needs.With ExFAT file system widely used,the data security issues become increasingly prominent,especially after the destruction of DBR,the partition can not normally access,data security to the user poses a serious threat.Currently ExFAT file system data recovery software,including R-Studio4.6,D-Recovery For ExFAT,both software can recover formatted or deleted user files,but can not guarantee 100% recovery.In fact,after the destruction of DBR,as long as do not click format,it is not necessary for data recovery,only need to analyze,calculate,and then manually rebuild ExFAT DBR file system can be.It describes the ExFAT file system structure,and then analyzes its DBR,finally introduces DBR manual reconstruction steps,parameter calculation method,combined with the checksum calculation functions developed checksum calculation tools,and specifically applied to the DBR＇s reconstruction process,with a strong practical value.

关 键 词：ExFAT 文件系统 格式化 DBR 重建 

分 类 号：TP31[自动化与计算机技术—计算机软件与理论]