Chosen Solution
Posting for a friend - although I’ve also done this in the past: I meant to run First Aid on a client’s internal drive, while booted from a different drive, but instead I accidentally erased the internal drive (!!!). I have Data Rescue, and am running the Deleted Files scan now. But from my understanding, it does not recover any of the original directory structure or filenames. I have not written any data to it - the only thing I’ve done since the erasure is initiated the Deleted Files scan. Do I have any options for restoring the client’s machine to its pre-erased state?
At this point your best option is to run a recovery application such as the one you are currently running. I am not aware of anyway to “unerase” the drive. Given the drive has not been booted and a secure erase was not performed most of the files should be on the drive. Some recovery programs will recover the name as well.