Extend System Partition on Windows Server 2003

Jean updated on Sep 12, 2019 to Partition Master | How-to Articles

Question: I am using Windows Server 2003. However, the Operating System Disk Manager will not allow me to extend system partition. Unfortunately, Microsoft Partner Support says I can only extend a Windows Server 2003 system partition by reformatting the drive and reinstalling the Windows Server 2003 Operating System or turning to a third-party solution. But I am not told which third-party solution I may use. Any ideas?

If you are facing the same or a similar problem as above listed, you can selectively follow either one method to extend Windows Server 2003/2012/2016, etc. system partition with ease now.

Method 1. Free Extend System Partition on Windows Server 2003 with Diskpart Command

Diskpart.exe is a text-mode command interpreter that enables you to manage objects (disks, partitions, or volumes) by using scripts or direct input from a command prompt. Before you can use diskpart.exe commands on a disk, partition, or volume, you must first list and then select the object to give it focus. When an object has focus, any Diskpart.exe commands that you type to act on that object.

You can only give focus to a partition on the selected disk. When a partition has focus, the related volume (if any) also has focus. When a volume has focus, the related disk and partition also have focus if the volume maps to a single specific partition. If this is not the case, then focus on the disk and partition is lost.

Disk Management Tool

  • Input Diskpart in the Search Bar, and click "OK" to enter the Diskpart utility.

If there is contiguous unallocated space behind system partition, you can follow steps:

  • Input list disk command, and press Enter. Then, all of the disks will be listed.
  • Input select disk x command to select the target disk, and then press Enter.
  • Input list partition and press Enter. Then, all the partitions will be listed.
  • Select the partition needs to be extended by inputting select partition x and pressing Enter.
  • Input Extend command, and press Enter.
  • Input Exit to leave the Diskpart window.

If here is no unallocated space right behind system volume, follw below sptes to you have to delete the adjacent drive to get an unallocated space by inputting the commands: 
list disk + hit Enter > select disk x > list partition + hit Enter > select partition y + hit Enter > delete partition + hit Enter > select partition x + hit Enter > extend + hit Enter > exit.

Tips: 1. The system volume can only be extended by running Diskpart.exe from a command line by bootable CD.

2. To extend system partition on Windows Server 2003, there must be some unallocated space behind the system partition. Otherwise, you cannot extend system partition with diskpart command, so a third-party server partition software is needed.

Method 2. Extend System Partition on Windows Server 2003 with EaseUS Partition Master Server Edition

To extend system partition on Windows Server 2003, we recommend you to use EaseUS Partition Master Server Edition. It is the best value server partition software to partition server disk for IT administrators. It manages Windows Server quickly and safely. You may perform basic and advanced partition operations on your Server without data loss, including: Resize and Move partitions, Copy Partition, Copy Disk, Copy Dynamic Volume, Create and Delete partitions, Format partitions, Convert partitions, Split partition, Merge partitions, Explore partitions, Hide and Unhide partitions, Set active partition, etc. Changes of server partition can be previewed before applying to hard disk, and all data is completely protected during any operation.

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 Server 2016 is supported

The most important feature of extending system partition on Windows Server 2003 by EaseUS Partition Master Server Edition is no data loss, but we still suggest you back up the server when you decide to extend system partition on Windows Server 2003 in case of unexpected shutdown or any other hardware failure.

Steps to Extend System Partition on Windows Server 2003


Step 1: Launch EaseUS Partition Master

Run EaseUS Partition Master

Step 2: Add space to the System C drive

1. Shrink partition and leave unallocated space for extending C: drive:

  1. Right-click on a partition next to the C: drive and select "Resize/Move".
  2. Drag the end of the partition that is next to the C: drive and shrink it, leaving unallocated space next to the system C: drive, and click "OK".

2. Right-click on the System C: drive and select "Resize/Move".

Extend System partition

To add space to the C: drive, drag the system partition end into the unallocated space.

Add space to C drive

Step 3: Confirm to extend system C drive

Click the "Execute Operation" button, it will list the pending operations, and click "Apply" to execute the changes and extend the C drive.

Confirm to extend system C drive
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 Server 2016 is supported


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Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

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The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

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On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

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