I have 8GB San-disk pen drive, I used to record programs from Set-top box, But when i used this pen drive to my computer it was nothing to show, even nothing detecting by computer. I have tried to so many computers but no luck.
So I used these steps and unlock or found by my system if anybody has this type problem then it can be solve.
First attach Pen Drive to system
And Go to... My computer icon and right click
Click on "Manage"
Now go to Storage -> Disk Management
Now you will see your pen drive in Disk 1 or you can guess for example if you are using 16GB pen drive then see space of 15.0 spaces and right click on this.
Now click on delete "Volume"
Now you will see Unallocated Space
Now again "right click" and choose "New Simple Volume"
Now you will see and volume wizard... Click Next... Next... Next and do Finish.
Now you can find your pen drive in your system. Hope it will help you.