Windows disk space not increasing with Hyper-V increase

Question

I first created a VM with 10 GB hard disk space but when Windows booted, there was only 69 MB free. Therefore, I created another disk (red-marked in image) but selected "Copy contents from existing disk". This new disk I created of 50 GB space but when Windows boots, it is showing old disk space only.

Old disk space

Even in the VM settings, it is pointing to red-marked big disk:

Answer 1

At the Hyper-V level, it's been expanded, but at the Windows OS level it has not. You should see available unallocated space at the Windows OS level via diskmgmt.msc. This is the space available to extend the Windows "C" drive from its perspective on a particular disk.

It really should just be a matter of giving the hypervisor VM disk additional space and then tell Windows to allocate it so it can start using it. This is usually very simple and easy to complete.

Solution

1. Go into Windows OS and then go to Disk Management via diskmgmt.msc.

2. Select the disk and right click on the partition which you want to expand its space.

3. Select Extend Volume and extend that over into whatever unallocated space it shows available.