If when working with Windows you are faced with the need to increase the size of drive C due to drive D (or a partition under a different letter), in this manual you will find two free programs for these purposes and a detailed guide on how to do this. This can come in handy if you receive messages that Windows does not have enough memory or the computer began to slow down due to the small free space of the system disk.
I note that we are talking about increasing the size of partition C due to partition D, that is, they must be on the same physical hard disk or SSD. And, of course, the disk space D that you want to attach to C should be free. The instruction is suitable for Windows 8.1, Windows 7 and Windows 10. Also at the end of the instruction you will find a video with ways to expand the system drive.
Unfortunately, using the standard Windows tools, you won’t be able to make the described change of the partition structure on the HDD without data loss - you can compress the D disk in the disk management utility, but the free space will be located “after” the D disk and it will be impossible to increase C due to it. Therefore, you will have to resort to using third-party tools. But I will also tell you about how to increase the C drive due to D and without using programs at the end of the article.
Increase C Disk Space in Aomei Partition Assistant
The first free program to help expand the system partition of a hard drive or SSD is Aomei Partition Assistant, which, in addition to being “clean” (does not install additional unnecessary software), also supports the Russian language, which may be important for our user. The program works in Windows 10, 8.1 and Windows 7.
Caution: Incorrect actions on hard disk partitions or accidental power outages during the procedure may result in the loss of your data. Take care of what’s important.
After installing the program and starting, you will see a simple and intuitive interface (the Russian language is selected at the installation stage) which displays all the disks on your computer and the partitions on them.
In this example, we will increase the size of drive C due to D - this is the most common version of the task. For this:
- Right-click on drive D and select "Resize Partition".
- In the dialog box that opens, you can either resize the partition with the mouse, using the control points on the left and right, or manually set the size. We need to make sure that the unallocated space after the section is compressed is in front of it. Click OK.
- In the same way, open the resizing drive C and increase its size due to free space "on the right." Click OK.
- In the main Partition Assistant window, click Apply.
Upon completion of the application of all operations and two reboots (usually two. The time depends on the busy disks and their speed), you will get what you wanted - a larger system disk by reducing the second logical partition.
By the way, in the same program you can make a bootable USB flash drive to use Aomei Partiton Assistant by booting from it (this will allow you to perform actions without rebooting). You can create the same flash drive in Acronis Disk Director and then resize the partitions of the hard drive or SSD.
You can download the program for changing Aomei Partition Assistant Standard Edition disk partitions from the official website http://www.disk-partition.com/free-partition-manager.html
Resizing a system partition in MiniTool Partition Wizard Free
Another simple, clean and free program for resizing partitions on your hard drive is MiniTool Partition Wizard Free, however, unlike the previous one, it does not support the Russian language.
After starting the program, you will see almost the same interface as in the previous utility, and the necessary steps to expand the system drive C using the free space on drive D will be the same.
Right-click on drive D, select the “Move / Resize Partition” context menu item and resize it so that the unallocated space is “to the left” of the occupied one.
After that, using the same item for drive C, increase its size due to the free space that appears. Click OK, and then apply Partition Wizard in the main window.
After all operations on partitions are completed, you can immediately see the resized sizes in Windows Explorer.
You can download MiniTool Partition Wizard Free from the official website http://www.partitionwizard.com/free-partition-manager.html
How to increase drive C due to D without programs
There is a way to increase the free space on drive C due to the available space on D without using any programs, only using Windows 10, 8.1 or 7. However, this method also has a serious drawback - you will have to delete data from drive D (you can preliminarily to transfer somewhere, if they are of value). If this option suits you, start by pressing the Windows + R keys on your keyboard and type diskmgmt.msc , then press OK or Enter.
The Windows Disk Management utility window opens, in which you can see all the drives connected to the computer, as well as the partitions on these drives. Pay attention to the partitions corresponding to the C and D disks (I do not recommend performing any actions with hidden partitions located on the same physical disk).
Right-click on the partition corresponding to drive D and select "Delete Volume" (I remind you, this will delete all data from the partition). After deletion, an unallocated unallocated space is formed to the right of drive C, which can be used to expand the system partition.
In order to increase the C drive, right-click on it and select the "Expand Volume" item. After that, in the Volume Expansion Wizard, specify how much disk space should be expanded (by default, everything available is displayed, however, I suspect you will decide to leave some gigabytes for the future D drive as well). In the screenshot, I increase the size by 5000 MB or a little less than 5 GB. Upon completion of the wizard, the disk will be expanded.
Now the last task remains - to convert the remaining unallocated space to drive D. To do this, right-click on the unallocated space - “create a simple volume” and use the volume creation wizard (by default, it uses all unallocated space for disk D). The disk will be automatically formatted and it will be assigned the letter you specified.
That’s it, it’s done. It remains to return the important data (if any) to the second disk partition from the backup.
How to expand system disk space - video
Also, if something turned out to be unclear, I suggest a step-by-step video instruction, which shows two ways to increase the C drive: due to the D drive: in Windows 10, 8.1 and Windows 7.
In the programs described, there are other useful functions that may come in handy:
- Transferring the operating system from disk to disk or from HDD to SSD, converting FAT32 and NTFS, restoring partitions (in both programs).
- Create a Windows To Go flash drive in Aomei Partition Assistant.
- Checking the file system and disk surface in the Minitool Partition Wizard.
In general, I recommend quite useful and convenient utilities (though it happens that I recommend something, and after half a year the program is overgrown with potentially unwanted software, so be careful always. Everything is clean at the moment).