1. Put in the 2008 R2 installation cd
2. In the System Recovery Options dialog box, click Command Prompt
3. Type Bootrec /RebuildBcd, and then press ENTER.
4. If the Bootrec.exe tool runs successfully, it presents you with an installation path of a Windows directory. To add the entry to the BCD store, type Yes. A
5. Next, I booted the server from a Windows 7 ISO and ran the Startup Repair option.
6. After running the startup repair, on the first boot, do let the check disk run. After which, you are able to logon to your Windows 2008 R2 server as per normal with your storage size enlarge.

Hope this helps for those with 2008 R2. :)

If your root partition is lvm type and you are using LVM try this out:
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Use LiveCD with dd and fdisk utilities:
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1) dd if=/dev/hda of=/dev/hdb # /dev/hda – old disk with smaller size, /dev/hdb – new disk with bigger size
2) fdisk -u /dev/hdb
3) Steps from 2) to 6) (incl.) described here – http://www.linuxquestions.org/questions/fedora-35/lvm-partition-resizing-666683/#post3281556
4) Shutdown the Virtual machine and remove the old disk and the LiveCD from the virtual CDROM

After the shutdown, boot the system normally (only with the new disk and without the LiveCD):
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5) pvdisplay -v # Checks the PV name (e.g. /dev/hda2)
6) pvresize –verbose /dev/hda2
7) vgdisplay -v # Checks the Free PE (e.g. 384)
8) lvextend -l+384 /dev/VolGroup00/LogVol00
9) resize2fs /dev/VolGroup00/LogVol00
10) Наздраве!
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Tested with VM:
CentOS release 5.4 (Final)
kernel-2.6.18-164.11.1.el5
lvm2-2.02.46-8.el5_4.2

Don’t do that on production systems but better create a new partition with fdisk and a new PV, extend the existing VG and LV after that (see http://www.linuxquestions.org/questions/fedora-35/lvm-partition-resizing-666683/#post3281556).

Be sure that you have a backup!!!

Best Regards,

Boyan Boychev
Bulgaria

Many thanks for the feedback on the OpenSolaris host.

Cheers, Nick.

I feel like I could live without ‘unallocated,’ but I don’t seem to be able to copy both of the others at once, and I’ll take Paul’s word for it that copying them sequentially won’t work. How do I proceed?

I forgot to expand the gui of my copied vdi. So I initially had the VDI + 40 Gigs of unallocated space. I went back in, expanded the GUI and voila!!!! Instant resized drive.

Lesson: READ THE ENTIRE POST FIRST. Don’t skim through it. If you brick your drive(s), you will have wished you had.

AGain, Great HOWTO…thanks a million!

This post was excellent. I was linked here from http://www.ubuntuforums.org, and was happy they knew of this gem. I just followed the steps one by one (some parts are outdated with the current version of VirtualBox), but all in all, it worked beautifully. I just rebooted, and was now finally able to finish the XP updates on my virtual install.