FAT file system error deletion data recovery method (Das Technology)

The FAT file system is applied to earlier system partitions. Under normal circumstances, the partition of the FAT32 file system cannot be larger than 32G. Due to capacity limitations, the FAT file system is commonly used with small-capacity hard disks and most flash media, such as cameras. SD card, CF card, memory stick, U disk, etc.

The principle of accidental deletion of files under the FAT file system and the data recovery method after accidental deletion.

After the file is deleted under the FAT file system:

1, will clear the FAT table of the file, the first byte of the file directory entry of the file is changed to E5!

2. The entry cluster of the file directory entry for this file is cleared.

First understand the hard disk data storage structure. We can think of the entire hard disk that stores data as a book, then the file directory entry is equivalent to the index directory of the first few pages of the book. When we want to read "an article", we will first find out which "page" the article is stored in the directory, and then jump to the specified page to find the article we need.

When we read a file, we first locate in the directory entry where the file was written from the hard disk, which is the entry cluster mentioned above. After finding the starting point of the file, if the file is stored continuously, then we can continue to read the length of the file to extract the contents of the file. But there is another situation. Because the data is often created and deleted, the storage of the file is discontinuous, there are fragments, and the high-order cluster is cleared. Therefore, this method is not practical! Because the files are not continuous, we follow the continuous The length of the file to read, then the extracted file is definitely wrong.

How to recover the files that were deleted by mistake? If you don't know the internal structure of the files, only the software scans! But why do some friends often say how I recover the word, excel recovers garbled! This is because the software is restored. It is recovered in a continuous manner. The file is fragmented, of course, it will be garbled when it is restored! In this case, the recovery will become very complicated. We need to write some programs to match the high cluster number. How to identify whether the matched high cluster is correct? However, this requires a better understanding of the recovered file structure, based on the file header of the file structure.

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