How to extend Windows 7 VM disk size on VirtualBox v4.2.16

Problem:

The 30GB C: drive was running out of free space on my Windows 7 VM guest on VirtualBox v4.2.16.

Solution:

1. Shutdown VM.

2. Extend it to 45GB:

[text]$ cd /home/user/.VirtualBox/HardDisks
$ VBoxManage modifyhd windows7.vdi –resize 46080
0%…10%…20%…30%…40%…50%…60%…70%…80%…90%…100%[/text]

3. Extend partition size in Windows 7

a. Start the VM

b. Run diskmgmt.msc > right-click C: > Extend Volume...

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