Have a USB thumb drive. Was using a Mac yesterday, saving, copying, and using multiple files from my flash drive. At the end of the day, I went to open a file and realized that two entire (and fairly important) folders were missing, as were several more recent files--some from the same day. Now my drive reads as though it has more space available than it should. I keep seeing all these scams and $50 services to recover lost files from flash memory. Anyone know of any reliable freeware or techniques I could use to get my files back? Any help is appreciated, thanks.