How to resize/extend boot partition in Windows Server 2016?

When the boot partition of Server 2016 is running out of space, worrying about data/system safety, many people are hesitant to resize disk partitions. Actually, if you select the right tool and follow the right steps, no problem. Here I recommend the software from Partition Magic Server, which integrates Enhanced Data Protection to keep everything intact while resizing disk drives. Further more, it is very easy to use, even for the people that are not familiar with operating computer. Today I’ll introduce how to resize/extend boot partition in Windows Server 2016.

What is Boot partition

In the Windows operating system, a boot partition is the disk partition that holds the files for the Windows operating system files.

The boot partition works with a systems partition, which contains the boot files and tells the computer where to look when starting Windows. These partitions are frequently the same in old versions such Server 2003/2008. In newer versions such as Server 2012/2016, there is a separate System Reserved partition marked as system when installing operating system.

Server 2016 boot partition

Boot partition getting full

The same with all other Windows operating systems, in Server 2016 you’ll encounter the same issue of insufficient free space. Windows updates, applications, temp files, caches and many types of files can easily eat up the free space in the boot partition. When the boot C drive is getting full, it changes to be red after opening My Computer or Windows Explorer. This is the reason why people want to resize boot partitions, by doing this, you can solve this problem quickly and easily.

How to resize boot partition on Windows Server 2016

To resize/extend boot partition in Windows Server 2016, there are two choice: Windows built-in Disk Management and 3rd party partition resizing software. In Disk Management console, you can extend boot partition with Extend Volume function, however, this function is limited. To resize boot partition or data drives, professional partition software is much more powerful.

Extend boot partition in Disk Management

  1. Open Disk Management by right-clicking Windows on bottom left in Desktop.
  2. Right click the boot C drive and select “Extend Volume”.
  3. Finish the Extend Volume Wizard.

It is not hard to do this, but as I said above, the Extend Volume function is limited. Only when there is adjacent Unallocated space, you can extend boot drive. This is the reason why some people shrank data drive D to get some Unallocated space, but Extend Volume is greyed out when right click C drive, because the Unallocated space is adjacent to drive D.

Steps to extend boot partition in Windows Server 2016

With partitioning software, there are no such limitations, you can extend boot partition by taking free unused space from any other drives in the same disk.

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

Resize volume

Select Resize

Step 2: In the pop-up window, drag left border rightwards to take free space out from D.

Drag to shrink

Shrink d drive

Drag to shrink

Click OK and back to the main window, 20GB Unallocated space created behind C: drive.

Unallocated created

Step 3: Right click C drive and select “Resize/Move Volume” again. In the pop-up window, drag the right border rightwards to hold the Unallocated space.

Drag to extend

Extend C drive

Extend C

Step 4: Click OK and back to the main window, C drive increased to 60GB by adding the Unallocated space. Click Apply on top left to execute, done.

C drive extended

Video guide to extend boot partition in Windows Server 2016

(Recommend full screen by clicking the square at bottom right of this video)

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