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I run Windows 7 inside VirtualBox.

I resized the disk of Windows 7 from 25 GB to 50 GB:

VBoxManage modifyhd Windows\ 7\ Pro.vdi --resize 50000
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

VirtualBox size

PROBLEM: I can' grow the partition, neither with Windows 7 itself nor with GParted:

Disk management

GParted

It looks like VirtualBox does not tell the client OS about the new size.
What additional step is necessary?

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there shouldn't be anything else required, although I have had better luck with gparted than right in windows. does your VM with that disk have any snapshots? resizing does not support disks with snapshots. – Ryan_S Sep 17 '12 at 21:12
up vote 15 down vote accepted

You can only resize disks if they are not part of a VM that uses snapshots.

If you are using snapshots, you can easily clone the state to a new VM and hard disk, and resize that one. VirtualBox 4 now supports cloning from the GUI, so it's super easy.

VBoxManage - modifyhd

Here's a helpful walk through of the whole process, Resize and Expand a Virtualbox Hard Drive and Media in 4 Steps

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