Windows Server 2003 Extend C Drive: Two Ways to Extend System Partition

Jean updated on Sep 10, 2020 to Partition Master | How-to Articles

Applies to extend C drive Windows Server 2003, 2008 (R2), 2012 (R2), 2011, 2016, and 2019, as well as Windows 10/8/7/XP/Vista. Though earlier Windows Server 2000, Windows NT before 2003 is rare to see nowadays, the solutions to extend system partition work on those operating systems, too.

Windows Server 2003 Extend C Drive

Windows Server 2003, 2003 R2, 2008, 2008 R2, 2012, 2012 the latest 2019 is recognized as an enterprise-level operating system with enhanced management solutions and robust hardware and software configurations. To ensure an enduringly stable performance of the involved highly configurable servers/computers, do not let your system partition run out of space. Otherwise, it will lag behind in boot time, loading large files, running applications, networking and so forth. Nonetheless, with regular disk cleanup, administrators still cannot escape from seeing "low disk space" on the system C partition. 

How to extend system partition on Windows Server 2003? Here we will guide you to extend C drive on Windows Server 2003 with Diskpart command and EaseUS Partition Master Server Edition. Both are simple and easy solutions to Windows Server 2003 extend C drive. Diskpart.exe is a built-in Windows disk management solution so you don't need to take time to download and install, but it requires unallocated space which comes from shrinking or deleting an existing partition drive. While EaseUS Partition Master is famous third-party personal OS and Server partition manager software, with many more overwhelmed options to manage the C drive space issue.

Diskpart & EaseUS Partition Manager
Method 1. How to Extend Windows Server 2003 C Drive Using Diskpart
Error: the volume you have selected may not be extended
How to solve common errors and extend C drive in Diskpart
Method 2. How to Extend Windows Server 2003 C Drive Using EaseUS Partition Master
Resize/move partition
Merge partitions

Method 1. How to Extend Windows Server 2003 C Drive Using Diskpart

To extend C drive on Windows Server 2003 with Diskpart commands, there must be a continuous unallocated space next to the C drive. This is the precondition that enables you to utilize the Diskpart command to take effect. Otherwise, you'll receive an error message that prevents you from executing the next command.

Error: The volume you have selected may not be extended

The volume you have selected may not be extended.
Please select another volume and try again.

windows server 2003 extend partition error

The reason behind the error message is concerned with the precondition as we've explained. It's due to the lack of unallocated space. In addition, the system volume can only be extended by running Diskpart.exe from a command line by a bootable CD.

unallocated space behind C drive

How to solve common errors and extend C drive in Diskpart

Step 1. Open Diskpart Command Prompt in Windows Server 2003

Input Diskpart in the search bar, and click "OK" to enter the Diskpart Utility.

Step 2. Extend C drive with continuous unallocated space

"x" in the examples refers to the number of a hard disk or partition.

  • 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 number of system partition that 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.

Step 3. Extend C drive with non-continuous unallocated space (Data backup is required)

When there is no unallocated space right behind system volume, you have to delete the adjacent drive to get unallocated space and then increase the C drive by inputting the relevant commands followed by the Enter key.

"x" in the examples refers to the number of a hard disk or partition.

  • list disk
  • select disk x
  • list partition
  • select partition y
  • delete partition
  • select partition x
  • extend
  • exit

Method 2. How to Extend Windows Server 2003 C Drive Using EaseUS Partition Master

To extend system partition on Windows Server 2003, we recommend you to use EaseUS Partition Master Server Edition. It is the leading server partition software to partition server disk for IT administrators. It manages Windows server hard drives 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.

Download Now

 Server 2019 is supported

The most noticeable feature of extending system partition on Windows Server 2003 by EaseUS Partition Master Server Edition is no data loss, plus the operation interface is much viewable. Though safer than the Diskpart command, 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. You got two options to undertake the process of increasing space in system C drive partition, which both ensure zero data loss.

Option 1. Resize/move partition without losing data

Step 1. Locate the Target Partition

To start extending partition, you should first launch EaseUS Partition Master and locate the target partition which you would like to extend.

Step 2. Extend the Target Partition

1. Right-click on the target partition which you would like to extend and select "Resize/Move".

Select target partition to extend

2. Drag the partition panel rightward or leftward to add unallocated space into your current partition and click "OK" to confirm.

choose another drive to allocate space

3. If there is no or not enough unallocated space on your disk, use the advanced partition resizing function to directly allocate free space from other partitions to the target drive without deleting or formatting.

Find the "Allocate XX space from" option, then click "Select partition". Choose the partition from which you want to allocate space. Drag the partition panel rightward or leftward to resize the partition you want to extend. Then click "OK" to confirm.

choose another drive to allocate space

Step 3. Execute Operations to Extend Partition

Click the "Execute Operation" button and click "Apply" to keep all the changes. 

finish extending partition

Option 2. Merge C drive with D drive without losing data


Step 1: Install and launch EaseUS Partition Master on your PC

Right-click on the partition which you want to add space to and keep on the hard drive, and select "Merge".

Run EaseUS partition manager software

Step 2: Select partitions to merge

1. Select one partition next to the former selected partition.
2. And click "OK" to continue.

Select partitions to merge

Step 3: Merge partitions

1. Click the "Execute Operation" button at the top and then click "Apply".
2. The program will merge space and add files from the second partition to the first partition.

Select partitions to merge

Was This Page Helpful?


Frequently Asked Questions

Why Choose EaseUS Partition Master?

"I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions."PCWorld

"Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available."TECH ADVISOR

"I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes."Lifewire

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

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

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.

What should I prepare before resizing the partition?

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.

About EaseUS Partition Master

All-round disk & partition management software for personal and commercial use. Let it manage your storage drive: resize, format, delete, clone, convert, etc.

Video Tutorial

How to Partititon a Hard Drive on Windows 10/8/7