My hard drive had only 37GB so I upgraded to a 320GB drive. I have cloned the old drive to the new drive. My problem is Windows 7 shows the new drive size as 37GB. In the Disk Management where it shows Disk 0, Disk 1, Disk 2 I can see the correct drive
size 320GB but the drive Properties shows 37GB. When I select the right-mouse "Format" menu the "Extend Volume" menu is grayed out. How can I make Windows 7 remeasure the hard drive size so the full 320GB drive is available and the menu Format->Extend Volume
As you have already cloned, you'll not be able to extend the partition. This is a general behaviour. If you ask me, I would say, backup the data - format the Hard drive - Delete and recreate the partition - reinstall the OS.