By Bryce / Last Updated July 14, 2020

Content
Can't increase C drive space in Windows 2003 Disk Management
Increase C drive space in Windows Server 2003 via Diskpart [limited]
Increase C drive space in Windows Server 2003 via a great third-party partition manager
Conclusion

Can't increase C drive space in Windows 2003 Disk Management

“My computer is running Window Server 2003 and the capacity of C drive is 56GB and D drive is 123GB. Now, the C drive is almost running out of space and shows a red bar and there is no unallocated space on the disk. Open Disk Management and I right-click C drive but find out that there is no Extend Volume option. Then, how to increase C drive space in Windows Server 2003?"

Increase C drive space in Windows Server 2003 via Diskpart [limited]

When there is unallocated space adjacently behind C drive, you can extend it in Windows Server 2003 without employing third-party partition software. You can turn to Diskpart utility. Now, refer to the steps given below about how to extend C drive in Windows 2003 using Diskpart utility:

Step 1. Press Windows + R, input "diskpart" and hit Enter to access Diskpart utility interface.

Step 2. Run commands as follows in order:

● list disks
● select disk n
● list partition
● select partition m
● extend size=x

✍ Notes:
◆ “n” refers to number of the disk that holds C drive; “m” is the number of C drive; x is the size n MBR that you want to add.
◆ You can type “extend” instead of "extend size=x" to increase C drive partition; if so, C drive will occupy all capacity of the adjacent unallocated space.
◆ If there is no unallocated space behind Partition C, you are unable to extend it. Or you can delete the partition behind C drive to create such unallocated space, but this will cause data loss.

Increase C drive space in Windows Server 2003 via a great third-party partition manager

When there is no contiguous unallocated space behind C drive and you don't want to delete partition, you can turn to a professional and reliable partition manager for Windows Server 2003, AOMEI Partition Assistant Server. It is featured with a powerful function – Allocate free Space, enabling you to directly allocate free space from one partition with redundant space to the partition that you want to extend. The whole process can be easy and effective.

It can also support Windows Server 2019/2016/2012 (R2)/2008(R2). Now, have a look at the tutorial about how to increase C drive space in Windows Server 2003 via it.

Step 1. Run the software, right-click the partition with enough space (here is D drive), and choose Allocate Free Space.

Step 2. In the small pop-up window, you can adjust the space that you want to allocate from D drive and choose C drive as destination drive. Then, click OK.

Step 3. Go to the main console automatically and you can preview the result of the operation. If you are satisfied, click Apply and Proceed.

✍Notes:
● After executing this operation, some free space will be allocated from the source partition to partition C. In other words, the source partition will be shrunk, and the C drive will be expanded.
● If there is an unallocated space (whether it is contiguous or non-contiguous) on the same disk, you can use AOMEI Partition Assistant Server’s Merge Partitions function to merge unallocated space to C drive.

Conclusion

Now, surely you have known how to increase C drive space in Windows Server 2003 even there is no unallocated space on the same disk. But if the whole disk is too small to meet your data storage demand, you can replace it with a larger one. To transfer all data including Windows Server operating system, you can clone the current disk to new larger hard drive in Windows Server.