Did the PS3 erased my flashdrives memory?

I put my flash drive into the ps3 (slim) to put some music on. Then I took it out to modify the way the PS3 recognizes the music files on my PC, but when I put them on my PC, ALL my files were gone. It says that the file is empty, but it still shows that I have used space on the flash drive. I have windows 7, my flash was fine the whole day and I did take it out properly before putting it onto my PS3. Is there a way to get my files back or a reason why this happened. My PS3 is fairly new as well, I got it just the other day!