Increase the partition size in Windows VMs created before Q1 2024

On older Windows VMs, the C-partition needs to be manually expanded.

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Once the disk size has been expanded in the control panel and the Windows VM has been restarted, log in via Remote Desktop. You now need to expand the C-partition.

This is only necessary for VMs created before Q1 2024. For VMs created after Q1 2024, the partition will grow automatically.

Expanding a disk is not always risk-free, so we recommend taking a backup before performing this operation.

Search for Computer Management in the Start Menu and click on it when it appears.

Next, double-click on Storage.

In the next window, double-click on Disk Management.

The C: partition and the adjacent unallocated space are now displayed. Right-click on the C: partition and select Extend Volume.

A wizard will now start. In the first dialog box, click Next.

In the next dialog box, the amount by which the C: partition will be expanded is displayed. In the example image below, it will be expanded by 10,240 MB, which is the same size as the unallocated space after the C: partition. Once you have verified that the information is correct, you click Next.

In the final dialog box, you get a summary of how much the partition will be expanded. Here, click Finish.

You are now returned to the disk overview in the Windows system. The C: partition should now be expanded, as shown in the image below. No unallocated space should remain after the C: partition.