Extend OS drive

Extend OS drive partition on Windows Server 2008

This article shows how to extend os partition drive on Windows Server 2008 (R2) without losing data. 3 options to expand OS drive by shrinking other volume or cloning to larger disk, select the one that fits for your disk partition configuration.

Extend OS drive by shrinking D

C drive runs out of space in both Windows client and server computers, because C drive is where Operating System running from and many types of files are saving into it continuously. In this situation, you can extend the OS drive with some disk partition tool, then you can solve this problem without starting over.

Windows Server 2008 has Extend Volume feature in native Disk Management, which is able to extend OS volume and any data drives. However, the only way to use this feature is by deleting the right adjacent partition. You can’t extend OS partition by shrinking D or other drive. Because Unallocated space is produced on the right side after shrinking D, but to extend C drive, Unallocated space must be on the left side of D. This is the reason why many people feedback that Extend Volume is disabled for C drive.

Extend Volume disabled

The best idea is running professional partition software for Windows Server 2008.

Caution There is potential system and data damage risk while resizing hard drive with 3rd party program. Some reliable software is called as “data killer” by the people that experienced disaster. It is important to make a backup and use safe partitioning software. As the safest tool in the market, NIUBI Partition Editor provides unique and powerful technologies to ensure system and data intact, including 1 Second Rollback, Virtual Mode, Cancel-at-will, Hot-Resize, etc.

Steps to extend OS drive in Windows Server 2008 by shrinking D:

Step 1 Download NIUBI Partition Editor, right click drive D and select “Resize/Move Volume”.

Resize volume

Drag the left border rightwards to shrink it in the pop-up window. You may also enter an amount in the box behind “Unallocated space before” (1024MB = 1GB).

Shrink D

Click OK and back to the main window, 20GB Unallocated space is produced on the left side of drive D.

Unallocated created

Step 2 Right click C drive and select “Resize/Move Volume” again, drag the right border rightwards to combine the 20GB Unallocated space.

Extend C drive

The OS partition is extended to 40GB in virtual mode, click Apply to take effect.

Partition C extended

Tip As I said above, this program is working in virtual mode. The operations you do will be listed as pending on bottom left and real disk partitions won’t be resized until click Apply to confirm.

Extend OS partition by shrinking nonadjacent drive

In some servers there may be not enough free space in the adjacent drive (D), then you can transfer free space from any nonadjacent partitions in the same disk. To do this, you just need an additional step to move partition.

Watch the video how to extend OS volume in Server 2008 by shrinking and moving partition:

Extend OS volume by cloning disk

Windows Server 2008 has been released for over 10 years, so the hard disk is very small if you did not replace it with larger device. In these servers, there may be not plenty of free space in all data volumes. In this case, NIUBI Partition Editor helps you clone the small disk to a larger one, OS partition drive can be extended with extra disk space while cloning.

Follow the steps in the video:

In Summary

To extend OS partition on Windows Server 2008 (R2), make a backup and run safe partition software, otherwise, it costs a long time to restore everything if damage happens. Besides the powerful data protection technologies, NIUBI Partition Editor complete partition resizing much faster because of its advanced file-moving algorithm. Find out your server disk partition configuration and follow the corresponding method to expand the OS drive.