I have a 500GB Western Digital USB Hard drive. It has tons of data stored inside it. I have some music, video and documents. It is the only backup source I am having. I have a system with me that has Windows XP Home & Professional. I was having some virus issue. My antivirus showed up that it is Quarantine. I had given the usb drive to my friend and when he returned it back there are were around 280 virus detected. After scanning, I re-connected the drive and it showed up as RAW partition. It was NTFS, how does it changed to RAW. I cannot see any of my data. Does a virus can modify the file system. How can I restore back or recover the data from it.