Virtualbox: Windows XP Guest on Ubuntu Linux Host: Resizing C:\

So my 10GB Windows XP VM (that'll be big enough!) ... wasn't big enough.

After some googling and some help from a friend, here's how I enlarged my image.

1. Shut down the VM.

2. From a terminal, run the following:

VBoxManage modifyhd /path/to/diskimagefile.vdi --resize SIZE-IN-MB

3. Then install 'qemu-kvm' package:

$ sudo apt-get install qemu-kvm

4. Load the network-block-device kernel module:

$ sudo modprobe nbd

5. Load the VDI file as a network block device using qemu-nbd:

$ sudo qemu-nbd -c /dev/nbd0 /path/to/diskimagefile.vdi

6. Use your favourite partitioning tool (i like gparted) to open the disk:

$ sudo gparted /dev/nbd0

Adjust your active partition size (you will see the original disk size, and available space up to the new size you set (as SIZE-IN-MB above). Commit your change. Bobs your Uncle.

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Oh, Windows will want to run

Oh, Windows will want to run a CHKDSK. Let it run.
In my case the 'please wait while Windows restarts' didn't result in a restart, so after about 60 seconds I cold restarted. It then needed a restart to account for 'new installed devices'. Good ol' Windows. However, afterward, I now have more disk space on C: than when I started.