Data recovery tips and tools in Linux systems

With the continuous development of computer technology, the importance of data is self-evident. However, we often accidentally delete important files, or the storage device fails, causing data to be damaged or lost. At this time, we need to use data recovery techniques and tools to repair it. This article will introduce the relevant knowledge and processes of data recovery in Linux systems, as well as some commonly used data recovery tools.

1. Prerequisites for data recovery

Before proceeding with data recovery, we need to understand some basic knowledge and prerequisites. First of all, we need to know that deleting data is not really deleting it, but marking the deleted file as a state that can be overwritten, so we still have a chance to recover the data before the file is overwritten. In addition, the success rate of data recovery is also affected by many factors, such as file type, physical state of the storage device, whether the data has been overwritten, etc.

2. Data recovery process

When performing data recovery, we should follow the following steps:

1. Stop writing: After discovering data loss, we Writing new data to the storage device should stop immediately. This is because new data may overwrite deleted data.
2. Confirm device status: We need to confirm the status of the storage device, including hardware failure, partition table damage and other issues. If the storage device has a hardware failure, you need to solve the hardware problem first. If the partition table is damaged, we can use some tools to repair it.
3. Scan device: Use a professional data recovery tool to scan the storage device and see if there are deleted files. During the scanning process, we need to wait patiently because the scanning process may be time-consuming.
4. Recover data: If the deleted files are successfully found, we can use data recovery tools to recover them. During the recovery process, we need to choose the path and naming method for file recovery.

3. Linux data recovery tools

The following introduces some commonly used data recovery tools in Linux systems:

1. Testdisk: Testdisk is a powerful tool An open source tool that can be used to repair partition tables, restore file systems, etc. It supports multiple file systems including FAT, NTFS, exFAT, etc.
2. Photorec: Photorec is a component of Testdisk that is specially used to recover files such as photos, videos and documents. It can deeply scan storage devices to find deleted files.
3. Foremost: Foremost is a command line tool that can recover multiple file types, including ZIP, JPG, PNG, etc. It can deeply scan storage devices to find deleted files and supports file filtering.
4. Scalpel: Scalpel is an efficient file recovery tool that can deeply scan storage devices to find deleted files, and supports network protocols such as HTTP and FTP.
5. Extundelete: Extundelete is a command line tool specially used to restore Ext3/Ext4 file systems under Linux systems. It can retrieve the file's original inode information from a deleted file and then recreate a hard link.

Summary:

Data recovery under Linux system requires us to have certain professional knowledge and choose appropriate data recovery tools. Before performing data recovery, we need to understand some basic knowledge and prerequisites, and follow the correct process to perform the recovery. Of course, the best way is to back up your data to prevent data loss.

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