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

WIPO Patent Application WO/2020/103493

A1

Disclosed are a method and a system for recovering a deleted file based on a FAT32 file system. The method comprises: reading FDT information of each directory entry Ri to form a first root directory FDT information set; parsing the FDT information of each directory entry Ri in the first root directory FDT information set FDTS={R1, R2, ..., RN} to obtain an attribute of the FDT information of the current directory entry Ri, and determining, according to the attribute, whether each directory entry Ri in the first root directory FDT information set represents the directory entry of a file or a folder; calculating an initial sector number of the directory entry Ri, obtaining an actual physical position of the current file, and recursively parsing the information of the directory entry Ri of the current file; and after parsing the FDT information of the directory entries Ri of all directories in the current file system to obtain the actual physical position of the current file or folder, parsing the information of the directory entry Ri. Moreover, quick recovery of a deleted file is effectively achieved by using a file feature-based FDT high cluster number dynamic calculation algorithm and a directory entry feature and information matching-based FDT high cluster number dynamic calculation algorithm.

SHAO BINGYANG (CN)
FAN WEI (CN)
SHEN CHANGDA (CN)
WU SHAOHUA (CN)

PCT/CN2019/099120

May 28, 2020

August 02, 2019

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XIAMEN MEIYA PICO INFORMATION (CN)

G06F11/14

CN109710455A	2019-05-03
CN105786653A	2016-07-20
CN106909542A	2017-06-30
CN1945571A	2007-04-11
US20120144090A1	2012-06-07
CN105786653A	2016-07-20

See also references of EP 3848808A4

XIAMEN FEBE INTELLECTUAL PROPERTY AGENCY GP (CN)

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