By Lucas / Last Updated August 24, 2022

Low disk space on Windows Server 2008 C drive

In Windows Server 2008, if there is little free space in the system C drive, Windows will pop out an alert saying “You are running out of disk space on system C: To free space on this drive by deleting old or unnecessary files, click here...”. The low disk space on Server C drive will cause many problems such as:

• System runs much slower and slower gradually.

• You cannot install any other new applications or Windows updates.

Therefore, it is necessary to extend C drive on Windows Server 2008 as soon as possible; otherwise, the system might crash someday.

Low Disk Space Server 2008

Resize partition in Server 2008 with Disk Management (Limitation)

To resize the partition on Windows Server 2008 or 2008 (R2), you can try Windows Server 2008 Disk Management. It comes with “Shrink Volume" and "Extend Volume" features, which can help you resize Windows Server 2008 partition in particular situations. In other words, it has some restrictions such as:

◆It can only support shrinking and extending NTFS partition.
◆When shrinking a volume, you will get unallocated space on the right side of the volume that is just shrunk.
◆It can only extend partition when there is an adjacent unallocated space on its right side.

Briefly, the unallocated space from shrinking a volume can only be used to extend its donor volume, and cannot be used to extend other partitions. For example, when you shrink D drive to extend C drive with the unallocated space, you will find the “Extend Volume” option greyed out.

Extend Volume Greyed Out 2008

For this problem, you may try to move the partition (like D) between unallocated space and the partition you want to extend (like C) to the right side. But Disk Management does not offer such a feature. So the only workaround is to delete the middle partition (such as D drive) to get a contiguous unallocated space for extending C drive on Server 2008. However, that will delete everything on the partition as well. So is there any way to extend C drive without losing data?

Easily resize partition on Server 2008 with AOMEI Partition Assistant Server

To resize partition without losing data on Server 2008 (R2), you can run AOMEI Partition Assistant Server. More powerful than Server Disk Management, it allows you to make unallocated space adjacent to the partition that you want to extend and shrink a partition beyond limits. And it is compatible with Windows Server 2000, 2003, 2008(R2), 2012(R2), 2016, 2019, 2022, and Windows PC OS.

Now, we will show you how to shrink D drive and extend C drive with generated unallocated sapce step by step. You can try the Demo version firstly.

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Feature 1. Resize Partition

Step 1. Run AOMEI Partition Assistant Server. Right click on D partition and select "Resize Partition".

Shrink Partition

Step 2. In the pop-up window, drag the right slider bar leftwards to shrink D partition to free up unallocated space and click OK.

Size Position

Feature 2. Merge Partition

 When the unallocated space is not right after the C drive after the D drive is shrunk, you can easily move the D drive to the right side with AOMEI Partition Assistant Server, which cannot be done in Disk Management. Moreover, you can directly merge the non-adjacent unallocated space into C drive using the “Merge Partitions” function.

Step 1. Launch AOMEI Partition Assistant. Right-click the partition (here is D:) which you want to merge, and select "Merge Partitions" in the drop-down menu.

Step 2. Tick partition and the unallocated space, click OK.

Choose Unallocated Space

Step 3. click "Apply" on the toolbar.

Feature 3. Allocate Free Space

Last but not least, when one partition has redundant free space and another partition is running out of space, you can also choose to allocate free space from one partition to another directly on Windows Server 2008 via AOMEI Partition Assistant Server. Namely, you don’t need to delete or shrink a partition to create unallocated space in advance.

Step 1. Launch AOMEI Partition Assistant, right-click the partition which you want to allocate free space from and select "Allocate Free Space".

Allocate free space


Step 2. Type in the size of the free space which you want to cut from D partition and this free space will be directly added into the destination partition. 

Allocate Free D To C Mbr Disk

Step 3. Click "Apply" to execute this operation.



With the help of AOMEI Partition Assistant Server, you can easily resize partition in Server 2008 (R2) without deleting any partitions or losing data. Besides resizing partition, this software aslo has many other amazing disk management functions such as clone partition, migrate OS to SSD, clone disk, convert disk between MBR and GPT without deleting partitions, convert dynamic disk to basic without losing data, etc. What's more, if you need to manage multiple PCs, you can choose the Unlimited Edition to efficiently manage many devices.