Look into a USB "hard drive toaster" and ddrescue. I've had success recovering from a failed drive. ddrescue will try to copy block by block (like the dd comm

Look into a USB "hard drive toaster" and ddrescue. I've had success recovering from a failed drive. ddrescue will try to copy block by block (like the dd command) but will deal with bad disks by retrying infinitely, and keeping a log of blocks successfully copied. In my experience, if you can get the drive to appear in the OS, ddrescue can (eventually) get most or all of the data back. And if it's not being seen by the OS, search for the hard drive freezer trick