I had a damaged SD card, was working on minute, next time I turned on the camera, card no longer recognized and prompt to format. It had a good number of photos and videos on it. I tried it in a mac, a PC, multiple cameras. Cameras wanted to format it as it couldn't read it and computers simply did not recognize it at all (so all those posts about using software to recover files, no luck, as those all need the computer to at least recognize something is in the drive). I tried a local place in NYC that gets great reviews for recovering electronic data - no luck. I then got in touch with Transcend, the vendor, and I shipped it to the US base in California where they had no luck. Then they shipped it Taiwan (yes this SD card has been all over the world!) for the real makers to work their magic. NO LUCK. I asked them to ship the damaged one back instead of replacing it with a new one which they said they would do as I knew I had one last option left that I was a bit skeptical about.
I then shipped it to Dresden, Germany to a place called RecoverFab: http://recoverfab.com/
1-2 days after they received the damaged SD card, they have uploaded 100 thumbnails to show proof they've recovered photos, and they have emailed me they recovered 370+ photos and 90 videos. Once I pay (not a small amount) they will give me an FTP site to download from so I don't need to wait for more shipping overseas of a DVD or something to get my data. SUCCESS!
The makers of my SD card could not recover data off of it, RecoverFab did.