Whether you're using a desktop computer or a laptop, one of the key things to focus on is how to protect your valuable data. Because there will always be various unexpected situations that will crash your system, and then all you have to do is restore the data. No matter what you think, if I lose all my data and I can't get it back, I'll dismember this broken computer in minutes. Fortunately, there are many data recovery tools on the market that can help us recover data from the system's hard drive.
1 Knoppix
Knoppix is one of the best tools for recovering data from damaged machines. It has a bootable CD version with friendly user interface. It allows you to easily mount the drive and then copy the data. Knoppix itself comes with a full set of Linux commands.
It is designed for Linux and is a freeware for recovery and repair operations. It has an easy-to-use scrolling text menu, and anyone with a keyboard and some knowledge of English can perform maintenance and repair operations on your computer, ranging from password resets, disk cleanup, virus scans, and more. You can use TRK in three ways:
● as a bootable CD
●Use the tool from a USB stick/hard disk
●For network
Official website: http://trinityhome.org/Home/index.php?wpid=1&front_id=12
The purpose of Ddrescue is to copy the data in this file to another. This is very helpful for recovering data placed on crashed and damaged disks. Ddrescuelog is a tool for manipulating ddrescue log files. It can display the contents of log files, realize mutual conversion between log files and other format files, compress log files, test rescue status, etc., and delete log files after the rescue is completed.
In addition, the basic operations of ddrescue are fully automatic.
Official website: http://www.gnu.org/software/ddrescue/ddrescue.html
这是GNU通用公共许可证授权的开源软件。它也是免费的数据恢复软件。Test disk可以帮助你修复分区表、恢复已删除的分区、修复FAT表和重建NTFS引导扇区。这个软件还能从备份中恢复NTFS引导扇区。Test disk非常易于操作，哪怕你对数据恢复知之甚少也可以掌握并轻易使用它。
Avira Rescue System能让你轻易地访问系统和其他已遭损坏的硬驱中的数据，它也是开源应用程序。这是一个GUI工具，不过，安装的时候有点点难度。
官方网站：http://www.avira.com/en/download/product/avira-rescue-system
它允许用户在驱动上操作分区，是一种现场分布。它支持多种文件系统，并允许调整、创建和删除分区。
官方网站：http://gparted.sourceforge.net/livecd.php
SystemrescueCD能帮助你修复系统和数据，并且它也是一种Linux系统急救盘，可作为可引导的CD ROM和USB存储器用于管理。该软件提供了处理各种任务的工具，例如分区操作、文件恢复、硬盘测试以及硬盘格式化。此数据恢复工具还可以用于Linux和Windows电脑，无论是台式机还是服务器。
Ubuntu Rescue Remix是最好的Linux数据恢复工具之一，是一种GNU/ Linux的实时系统。它简直就是数据恢复专家，配置了免费的开源数据恢复和取证工具的命令行界面环境。这个工具在恢复和救援文件、系统文件，以及修复来自非标准外部驱动器的数据时，非常有用。它可以用一种非常简单的方法恢复删除的文件。
官方网站：http://ubuntu-rescue-remix.org/
Stellar可以恢复基于Linux卷上丢失了的、格式化的和被删除的数据。它可以恢复基于Linux卷的Ext4、Ext3、FAT32、FAT16以及FAT12文件系统的数据。它可以恢复所有丢失的文件、目录和硬卷。它可以轻易地恢复所有可用的硬驱类型数据，包括SCCI、ATA、EIDE和IDE。而且界面非常友好，可以形象化整个硬盘、卷和其他任何选定的区域。
官方网站：http://www.stellarinfo.com/linux-data-recovery.htm
该软件拥有灵活的参数和自定义设置。它能让用户完全控制数据恢复的任务。它可以恢复来自Windows、FreeBSD/open BSD/NetBSD/ Solaris和Macintosh格式化磁盘上的文件。它可以恢复已经在计算机中删除并被垃圾桶清空的文件。它还可以安全地恢复由于病毒、断电或突然关机而损坏的文件。
官方网站：http://www.r-tt.com/data_recovery_linux/
此Linux数据恢复工具基于Linux OS的Knnopix衍生产品，可以帮助用户从CD运行软件，并检查已安装了的应用程序的完整性。F-Secure Rescue安能让你轻松地执行高级数据修复和恢复操作。
官方网站：https://www.f-secure.com/en/web/labs_global/rescue-cd
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