How to increase C drive disk space without losing data?

Windows create the low disk space warning to alert computer users when their hard drive is running low on available disk space. The first warning appears when a drive has less than 200 MB of available disk space, the second warning appears when the drive has less than 80 MB of available disk space and the most urgent warning appears when the drive has less than 50 MB of available disk space. As your disk space decreases, the frequency that the low disk space warnings pop-up on your screen increases.

On Windows XP/Server 2003

Low disk space 2003

On Windows Vista, 7, Server 2008

Low disk space

In some Windows versions such as Server 2012, you’ll see the C drive becomes red after opening My Computer.

C drive red

No matter you are running Windows XP/Vista/7/8/10 or Windows Server 2003/2008/2012, you can increase C drive disk space directly without losing data or reinstalling Windows.

Steps to increase C drive space

Step 1: Download and install the partition software from Partition Magic Server, right click a data drive that has plenty of free space and select “Allocate Free Space“.

Allocate space

Step 2: In the pop-up window, type the value how much unused space to take from the data drive E:, select C: as the target drive in drop-down box.

Add spaceStep 3: Click OK and back to main window, click “Apply” button on top left to proceed, done.

C drive extended

If there is already free Unallocated space existed, you can add the free space to C drive directly.

Increase C drive size with Unallocated space

Step 1: Right-click the 10 GB Unallocated space and select “Merge Partitions“.

Merge partition

Step 2: In the pop-up window, click the check-box in front of C: drive and click OK.

Select drive

Step 3: In the main window, press “Apply” button on top left to proceed, done. The 10 GB Unallocated has been added to C: drive.

Drive extended

It is very easy to increase C drive disk space, however you’d better select the reliable partitioning program. The software from Partition Magic Server integrated enhanced data protection technology and disk partition clone, all files keep intact after resizing the partitions. It is compatible with Windows 10/8/7/Vista/XP, Windows Server 2016/2012/2008/2003 and Small Business Server 2011/2008/2003 both 32 and 64 bit. It supports local and removable hard disk, USB disk, memory cards, all types of hardware RAID and VMware/Hyper-V virtual disks.

Solve the problem ASAP

When there is not enough free space left in system C drive, you should try to solve this problem as fast as possible, because:

  1. System runs much slower.
  2. You cannot install Windows updates and applications.
  3. System crash if extremely low free space remains.

Follow the steps above, you can easily increase C drive space by taking unused space from other data drives. BTW, you’d better change the way running your computer:

  • Keep data separate from the Operating System, one partition for Operating System, one partition for applications and the others for data.
  • Change default download and cache path of the applications out of C drive.
  • Delete caches and temporary files with Windows built-in Cleanup utility regularly.


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