I recently installed a new, larger hard disk in my PC at work (the office wouldn't spring for an upgrade for my 75GB disk, so I brought my own 2TB disk in from home). I managed to clone the original drive using CloneZilla, but now I have a 75GB partition on my new drive, followed by a 300MB partition, followed by a 1794.65GB of unallocated space. What I want is to add the unallocated space to the 75GB partition, thereby maximizing my C: drive.

However, when I right-click on the C: partition, the option to "Extend Volume" is grayed out. How do I get all my fancy new extra space to be part of my C: drive? I also tried booting with GParted, but I get the same deal - cannot adjust the C: drive because there's no contiguous space.