Mobile phone connected to the computer does not show how to do?
If you do not control the panel again - Administrative Tools - Computer Management - Storage - Disk Management (Local).
Not necessarily driven by the problem, I have encountered such a situation, you first find a U disk to see if there is no display letter inserted.
If you plug in the other U disk can be displayed, then you have to check the phone's memory card (you can change a try).
