This package contains two recovery/ forensic tools:

TestDisk checks and recovers deleted partitions. It understands all
common filesystem formats.

PhotoRec is a file data recovery software designed to recover lost
files including video, documents and archives from hard disks and CD
Rom and lost pictures (Photo Recovery) from digital camera memory.
PhotoRec ignores the filesystem and goes after the underlying data, so
it works even if your media's filesystem is severely damaged or
reformatted.