This free open-source tool can save a partition that's been overwritten and recover lost files.

Has anyone used TestDisk to recovery hard drive partitions? I have have a shucked drive from a Seagate SRD00F2 external drive (Amazon link), that to the best of my knowledge does not run hardware ...

Perform low-level disk repair and file recovery--from a command prompt or DOS box--with free utility duo TestDisk and PhotoRec.