So i have this Sony 8gb usb that i have been using for the last several months. never had a problem, totally loved it. today, i wanted to print off some files from a desktop, so i don't have to load the printer drives into my MacBook. put the usb in the desktop (running Windows Xp), has no problem loading, i click and drag the files i need, print them, everything is fine. so i remove my usb from the desktop, and plug it back into my macbook. empty. nothing, nada, empty. so i was like, "wtf?". i plugg it back into the desktop, same thing, nothing. back and forth and neither can see anything. the info says that there IS stuff on the usb, (approx 4gb), so it means it didn't get deleted. i did also pull out the stick without "ejecting" because windows kept saying something was using it, when there was absolutely nothing even running on the computer. so now i have a bunch of files that have become invisible. any help? thanks!