If you have a flash disk containing important or sensitive private data you should consider to protect your valuable data inside it. You can use the USB Safeguard to do this. USB Safeguard is a freeware that provide a complete protection to you USB disk.
Your Boot Info Script output shows just a single ~8GB disk on your computer. This looks suspiciously like a live disk, so my suspicion is that the disk you used lacks drivers for your disk controller -- or perhaps there's a bug in the Boot Info Script that's preventing it from showing your hard disk.