TestDisk & PhotoRec 
TestDisk & PhotoRec are free and open-source data recovery utilities. They can be downloaded from https://www.cgsecurity.org/.
TestDisk can be used to recover lost partitions, fix boot sectors, and recover files from damaged or deleted file systems. It is mainly used to recover data from hard drives, but it can also work with other storage devices such as USB drives and memory cards. It supports a wide variety of file systems, including NTFS, exFAT, FAT, ext2, ext3, and ext4.
PhotoRec is designed to recover lost files, including photos, videos, and music files, from various types of storage devices. It can recover files from hard drives, memory cards, and USB drives, and it can also recover files from digital cameras and other portable devices.
.. toctree:: :maxdepth: 2 :numbered: :includehidden: presentation installation building_from_source livecd storage running repairing_filesystem undelete partition_recovery bootable photorec photorec_custom_signature photorec_video after_using_photorec smart ddrescue scripted_run testcase unix