C Drive Partition Solution Cannot be Extended

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The size of the C drive partition that is too small can indeed be a problem in the future. The more programs we install and the files we download, over time the C drive on the laptop will be full. For that we need to extend or enlarge the size.

The problem is that sometimes the C drive on a laptop cannot be extended, because of unallocated space that is not available or because there is a problem with the mounting drive.

In a previous post I have given a tutorial on how to increase the size of the C drive in Windows, if the conditions are normal then the process should run smoothly without any problems. But if it turns out that the C drive on your laptop cannot be extended, then in this post I will share how to solve it.

How to Overcome Partition C Cannot be Extended

1. Install the AOMEI Partition Assistant application

In order to be able to extend the C drive partition, we need the help of a partition manager tool. My recommendation is AOMEI because this application is quite easy to use and stable. You can get it via here:

2. Run AOMEI, scan all disks on the laptop

Once installed, run the AOMEI application. Then wait until the application detects all the partitions on our hard disk.

3. Pay attention to the division of the hard disk partition on the laptop, see if there is space that can be used to extend drive C

If the hard disk on the laptop only consists of 1 hard disk which is divided into several partitions, then there is a possibility that we can increase the size of the C drive.

But if the case is that drive C is on a separate hard disk, for example you use an SSD for drive C and a regular hard disk for drive D, then drive C cannot be extended. Because we cannot combine 2 hard disks into 1 partition. An example is like the image below, where drive C and drive D are on 2 different hard disks.

how to extend drive c . partition

Try to see the position of the partition on your hard disk, are drive C and drive D (or other partitions) on 1 hard disk? If so, then we can take space from the partition in front of it to extend drive C.

For example, like the image below, where we can take space on drive D to extend drive C.

drive c solution can't be extended

4. Slide the D drive partition forward to create unallocated space at the bottom of the D drive partition

Even though there is still free space on drive D, we can’t just extend drive D just like that. We have to create unallocated space first at the base of the D drive which we will later insert into the C drive.

So the first step to do is to move / move the partition drive D to the front.

How to increase the size of the C . drive

The trick, in the AOMEI application, click drive D > select the Resize/Move Partition menu.

Later a window will appear to shift the D drive partition as well as resize it.

Pull the size limiter forward sufficiently, according to how many GB of space you want to extend to drive C so that later a new unallocated space will be created at the base of the drive D partition. See the following image for easier understanding:

how to increase the size of the C drive take from the D drive

After clicking the OK button, then click the Apply button again in the upper left corner of the AOMEI application. Wait until the process is complete.

After the process of shifting the D drive partition is complete, we will see that there is a new unallocated space right in front of the C drive partition.

how to increase the capacity of drive c in windows

5. Extend drive C by entering the unallocated space that was created earlier

The next step is to add unallocated space to partition C.

You do this by clicking once on the C drive > select the Resize/Move Partition menu.

In the Resize/Move Partition window, drag the size limiter until it sticks forward so that all unallocated space goes to drive C > click Ok > click Apply.

The AOMEI application will combine unallocated space into partition C so that later its capacity will increase. Wait for the process to finish and boom! Succeed! Easy isn’t it?

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