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How to Add Space to C Drive to Increase C Drive Space

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Daisy updated on Feb 19, 2021 Partition Master | How-to Articles

Why Do You Need to Add Space to C drive

Case 1. "I have an 18GB disk drive that has been split into partitions: C: and D:. C: has about 4GB and D: has about 14GB. However, my C: drive is running out of space. How can I add space to C drive from D?"

Case 2. "I am running windows 2000 server, the C: Drive is only a 4 GB partition and 60GB on its D: Drive. How can I increase C drive space so I can do Windows updates and install a program?"

Case 3. "Well when I reformatted my computer I ended up making 2 partitions. I realized how useless the second one was so I deleted it. How can I now add space to C drive?"

There are many similar cases. Low disk space is one of the issues that many users may encounter. After long time usage of your computer, it pops up a warning message says "Low Disk Space – You are running out of disk space on the system (C:) To free space on this drive by deleting old or unnecessary files, click here..." 

c drive is out of space

Your system partition doesn't have enough free space. And you need to increase your C drive space. If you are in a hurry, here's quick access to adding space to C drive to increase C drive size: 

Is It Possible to Increase C Drive Space

Yes, it is. You can increase C drive space. There are basically two major directions. One is to extend C drive Windows 10, and the other is to free up C drive space Windows 10. The ideal solution is adding space to C drive to increase C drive space because cleaning up space may cause data loss. You can add more space to existing primary partitions and logical drives by extending them into adjacent unallocated or free space on the same disk. Usually, there are three ways to add space to the C drive in Windows 10, 8, and 7. You can use EaseUS Partition Master, try Windows Disk Management or use a command line.

Three Ways to Add Space to C Drive to Increase C Drive Space 

To completely solve the low disk space problem, we should allocate free space to C drive from unallocated space or other partitions. Here are three ways to add more space to the C drive.

Solution 1. Add Space to C Drive with EaseUS Partition Master

For average users who know little about Disk Management, how to add space to C drive is not an easy task. It is true that Windows built-in Disk Management tool can add space to C drive. But the precondition is that there must be continuous space behind C drive. Otherwise, you cannot increase C drive space with it, like Windows Vista, Windows 2008,   or Windows 7 Disk Management cannot move the partition to let continuous space behind the C drive which you want to extend. The good news is there is a simpler way. You can use third-party software to add space to C drive.

EaseUS partition software is the perfect specialist partition manager to help you move space to your C drive in Windows 10, 8, and 7.

Watch this video to see how to adjust your C drive easily and quickly with EaseUS Partition Master.

Here is a step-by-step guide on how to use it:

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

Bouns Tip: Extend Low Space C Drive with EaseUS Partition Master

When your C drive is running out of space, you can apply the new feature of EaseUS Partition Master to adjust low disk space in 1-click.  Here's the detailed guide:

Step 1. Launch EaseUS Partition Master and click "Adjust with 1-Click."

When your C drive is out of space, you will see the Low Disk Space alert on our product.

How to Adjust Low C Drive Space Step 1

Step 2. Click "Proceed" to adjust space automatically.

EaseUS Partition Master will automatically adjust your C drive to solve the low space issue. Click "Proceed" to continue.

How to Adjust Low C Drive Space Step 2

You can also click "Manual Adjustment" to extend the C drive manually if the Smart Space Adjustment cannot meet your needs.

When turning to Manual Adjustment, the result of smart adjustment will be retained as the starting point for manual adjustment. Select the C drive, and drag dots to add more space to C drive. Then click "Proceed" to continue.

Manually Adjust Low C Drive Space

Step 3. Execute operations.

Click the "Execute Operation" button at the top corner and start all pending operations by clicking "Apply".

How to Adjust Low C Drive Space Step 3

Solution 2. Add Space to C Drive with Disk Management in Windows 10

You can also increase space in C drive using Disk Management. Only if there is unallocated space very behind C drive, can it be increased Disk Management? Otherwise, the C drive's extend volume option will be greyed out. 

Step 1. Right-click "This PC" and go to "Manage > Storage > Disk Management".

Step 2. Select the disk you want to extend, right-click it and click "Extend Volume".

extend c drive spcae with disk management

If you don't have unallocated space, choose the partition that is next to C drive and select "Shrink Volume" to create some free disk space. Then, select the disk you want to extend, right-click and choose Extend Volume to increase disk space.

Solution 3. Add Space to C Drive with a Command Line

If you are familiar with command lines, you can add space to C drive with a command line. Follow the steps below:

Step 1. Open a Command Prompt and type diskpart.

Step 2. At the Diskpart prompt, type the following commands:

  • list volume
  • select volume
  • extend size
  1. List volume: Displays a list of basic and dynamic volumes on all disks.
  2. Select volume: This selects the basic volume number that you want to extend into contiguous, empty space on the same disk.
  3. Extend: This extends the selected volume by size in megabytes (MB).

To Sum Up

Disk Management can help us extend system C drive in seconds. However, the disadvantage is that you have to format other drives to allocate free space from one partition to another. The command line also has the same limitation. So, the best way to add space to C drive is by using EaseUS Partition Master. This software makes it effortless to partition hard drives and take full advantage of your disk space. Besides the partition manager, EaseUS Partition Master provides partition recovery and disk or partition copy features.

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