I (my daughter) have a USB Pen drive with work on it. Today when it plugs into the computer it gives the message that the drive isn't formatted do you want to format it. Well obviously not at the moment but I also can't recover any files. I have tried a number of programs including DDR Pen Drive Recovery and Ontrack Easy Recovery but neither of them find any files at all. If I look on Windows Disk Management it can see the drive (K) and size and also says that it is healthy but again I can't access it. What else can I try to recover the files? Thanks in advance for any help on this one.