DiskView

DiskView shows you a graphical map of your disk, allowing you to determine where a file is located or, by clicking on a cluster, seeing which file occupies it.
Homepage:	http://technet.microsoft.com/en-us/sysinternals/bb896650.aspx

Description

DiskView shows you a graphical map of your disk, allowing you to determine where a file is located or, by clicking on a cluster, seeing which file occupies it. Double-click to get more information about a file to which a cluster is allocated.