One of my coworkers dropped a laptop about 5 feet onto a hard surface. Miraculously, nothing appears to be damaged except the hard disk, and even that isn't a total loss. It is still recognized by the BIOS, and still capable of getting to the Windows 7 Startup Repair's command prompt.
Most of the data has previously been transferred off, but at the time of the damage data was being acquired and stored in CSV text files. These files are quite large and I believe that only a few of the sectors containing the file content are actually bad. And text files are still quite useful even with chunks missing. Robocopy got some files, but if there's any inaccessible blocks it skips the entire file.
In these questions, I found a recommendation for "Roadkil Unstoppable Copy":
However, this tool won't run inside Startup Repair. The exact error message is "the subsystem needed to support the image type is not present." Any suggestions of a console subsystem tool?