Is this an internal or external drive - if external is it shown as disk in device manager or only under usb heading
Is it shown in disk management
that is right click computer and click manage
click disk management in left pane
If it is shown their and the drive is new, select and right click, click format NTFS, create primary partition - whole drive unless you wish to parttion into allocated capacities.
Then check again
see this for further information
http://www.sevenforu...create-new.html