it might not have a partition. to see if you need to make a partition, go and follow this guide. it's really simple. if you find a "Not Intialized" under Disk Management, then we know what the problem is.
http://technet.microsoft.com/en-us/m.../gg309170.aspx
or quick vid tutorial (skip to 1:00)
http://www.youtube.com/watch?v=O7_aZ...qhJEHWhZHBXodW