When you plug in your pen drive or mp3 player you are unable to access it and suddenly your system stops responding .Then it is due to the bad sectors in your pen drive that is due to memory pool corruption.I can give you a simple step to recover your drive.

· Plug in your pen drive or mp3 player.

· Don't access it .

· Now restart the system with the device plugged in your drive.

· During the booting process the 'check disk ' utility runs and scan your drive do not skip it wait for it to complete.

· After the system boots up you will be able to access your drive.

Note: If you have any virus on your pen drive it can affect your system. So your pen drive should be virus free.