How to Increase C Drive Space

Is your computer running slower than usual, or are you constantly seeing “Low Disk Space” warnings? Usually, it’s because your C drive is running out of space, which can impact your system’s performance and prevent you from installing important updates.

This post will guide you through a few tested methods to extend your system C drive in Windows 11/10/8/7/Vista/XP.

How to increase C drive space in Windows

Here are the three disk management tools to help you increase the C drive space in Windows for free:

 EaseUS Partition MasterDisk ManagementDiskpartProsExtend the partition without deleting any partitions.It can expand the C drive with or without adjacent unallocated space.Built-in disk manager to increase the C drive space.Run commands to extend or shrink the system partition.ConsNeed installation.It requires contiguous unallocated space to extend the disk.The Extend Volume feature only works on NTFS drives.Difficult to use.Incorrect operations can lead to data loss.Best ForAll levels of Windows users, especially beginners.Experienced Windows users.IT professionals.

Pick up a suitable disk manager and prepare for extending your C drive:

✅ Check if the system disk is healthy.

✅ Back up valuable data on C drive in advance.

✅ Ensure there is contiguous unallocated space if you choose to use Windows Disk Management.

Method 1. Increase system partition via EaseUS Partition Master

As a tool for extending C Drive space with ease, EaseUS Partition Master Free offers a flexible solution by allowing you to extend the C drive even if there’s no adjacent space available. In addition, if you received the “Low Disk Space” alert, this software will automatically display a notification with the option to 1-Click Adjust, smartly reallocating unused space from other drives to extend the C drive.

Download EaseUS Partition Master and follow the step-by-step instructions below:

Tutorial 1. Extend the C drive via unallocated space

If you have no contiguous unallocated space, follow the tutorial, and EaseUS Partition Master enables you to move or resize other partitions, creating space next to the C drive.

If you already have unused space on the system disk, you can directly add the unallocated space to the C partition whether it’s adjacent or non-adjacent.

Step 1. Right-click on the partition next to the C partition and choose “Resize/Move”.

Step 2. Drag its end to shrink space, create new unallocated space behind the system C drive, and click “OK.”

Step 3. Right-click on the C partition and select “Resize/Move.”

Step 4. Drag the system partition’s left panel into unallocated space and click “OK.”




EaseUS

Step 5. Click “Execute Task” > “Apply” to keep all changes you made.

Tutorial 2. Smartly enlarge C drive with low disk space warning

Step 1. In the Partition Manager tab, hover over the C drive and click “Adjust with 1-Click.”

Step 2. Select “OK,” you can also choose the “Manual Adjustment” option to decide how many GB you want to add to the C disk.

Step 3. Click the “Execute Task” and “Apply” at the top corner and start all pending operations.

This tool can help users automatically resize system partitions and solve the Low Disk Space Error.

Method 2. Increase C disk space via Disk Management

Disk Management is a built-in utility in Windows that can perform various tasks to manage your computer’s storage devices (disks and partitions). However, it has some limitations that may hinder disk extension: