METHOD AND SYSTEM FOR RECOVERING DELETED FILE BASED ON FAT32 FILE SYSTEM

• Main Authors: WU, Shaohua, FAN, Wei, SHAO, Bingyang, SHEN, Changda
• Format: Patent
• Language: English; French; German
• Published: 14.07.2021
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

A method and system for recovering deleted files based on a FAT32 file system is disclosed. A first root directory FDT information set is formed by reading FDT information of each directory entry Ri; FDT information of each directory entry Ri in the first root directory FDT information set FDTS = {R1, R2, ..., RN} is parsed to obtain attributes of the FDT information of a current directory entry Ri, and whether each directory entry Ri in the first root directory FDT information set represents a directory entry of a file or a directory entry of a folder is determined from the attributes; a starting sector number of the directory entry Ri is calculate to obtain an actual physical position of the current file, and information of the current file directory entry Ri is recursively parse out; and the FDT information of the directory entry Ri of all directories in the current file system is parsed to obtain the actual physical position of the current file or folder and information of the directory entry Ri. Fast recovery of the deleted file is effectively realized using a file feature-combined algorithm of dynamically calculating FDT cluster higher bits and a directory entry feature and information match-combined algorithm of dynamically calculating FDT cluster higher bits.