Try the recovery apps shown in the bottom posting of this thread: http://forums.sandisk.com/t5/All-SanDisk-USB-Flash-Drives/repair-files-after-removing-cruzer-edge-USB-from-computer-during/m-p/232036#M966
Normally the removal of U3 does a Quick Format which doesn’t actually erase the data just the FAT. You may be able to recover some files if you haven’t written to the USB drive since this happened.
hth
