USB recovery app for Android?

[Jamie Nomad]

I'm long term world traveler who uses my galaxy s2 phone for everything. After leaving a country I move the photos from my phone to Facebook and a usb key. Unfortunately my phone rebooted while I was moving photos to my external usb memory key and seems to have corrupted it in the process as it says it is now blank. It contains approximately 20 GB of files so didn't have enough time to delete them they must still be there but the directory or something damaged. I have plugged the usb stick into a laptop which also said it was empty or corrupted. Can anybody suggest a recovery app I can load on my Galaxy S2 (Android device).
Any suggestions appreciated as I won't be home for a long time yet and just arrived in central America where I don't expect to get much help!

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[Rukbat]

Not on your S2, but on a computer (or laptop) with a CD or DVD drive. Download PhotoRec - Digital Picture and File Recovery While you're there, download Test Disk. (They're free apps, but they're worth more than anything Microsoft ever created.) Burn them to CDs (1 to a CD). Boot PhotoRec (with the SD card in the computer). Let it search for deleted songs, pictures, whatever you need. (Be patient - that beard will be a bit longer before it's done.)

If that doesn't do it, boot Test Disk and see if there are any partitions on the card that aren't showing up normally. Bring them back, then look for the missing files with PhotoRec again. (I'm not kidding about the length of time - on a large hard drive, you could run out of universe before it finishes.)

Anything PhotoRec can't find just isn't there.