I am having a PEN Drive (Kingston Data Traveller G3 - 16GB). In the morning I was using the PEN Drive on one of my PC's and it was working fine. Then I Shut down the system and plugged my PEN drive on to another system. And it gave the message like that "The disk is not formatted. You need to format it now". When all other methods failed, I formatted the drive and from then onwards its size has been changed to mere 8MB. I have no clue how that happened and need to get the data back.
The drive had a hidden 2GB volume encrypted with the help of TrueCrypt algorithm which could be mounted using only a password.