[100% Solved] Can I Extend C Drive in Windows 10/11 from Another Disk?

Extending C drive from another disk is easy, but few software or methods can do this directly. Don't worry. The solutions in this article can extend C drive immediately when the two volumes are not on the same HDD or SSD.

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Wondering the same thing about your operating system's drive? Check out the new quiz on SuperUser.com.

"How can I extend the C drive with another hard drive? I have two 30 GB hard drives… I want to extend the first one with the second one. Is there any way to do this? (Without reinstalling everything) Win8 took up 25 GB in two days…"

When the C drive is full, cache files generated by apps and other installed programs can make your device slower than ever. As a result, you might experience high disk usage, stuck Windows updates, and other issues.

When encountering such problems, the best solution is to expand the C drive space, and here I recommend a powerful and secure disk partition software for you!

Resize C Drive with Professional Software from Another Disk

Low disk space on C drive? Receiving "disk space running out" warning? I often encounter such warnings before downloading new games or updating the Windows OS. So, I'd like to recommend this solution - AOMEI Partition Assistant Professional - to help you get more space for the system drive. AOMEI Partition Assistant has launched a new feature that allows you to expand the system drive from another disk.

If you're running out of disk space (you receive the “low disk space” warning) and have a second disk with enough free space, this software can create a new partition on it without deleting any data. Programs and data in the system partition will automatically migrate to the new disk to extend the original space of Drive C.

More information about the Partition Master tool:

How to use a Partition Master tool to expand C drive from another disk

Here, you can find more detailed instructions and some precautions. Remember not to select an external device and do not interrupt the partition creation process.

Some suggestions for using this feature:

1. Will this function transfer all files from the C drive?

No, Windows components and personal desktop data are not migrated.

2. Can I choose a third hard disk?

If you have multiple disks, you can choose to move the disk to the second or third disk, and so on.

Is it a question of capacity or velocity?

There are no limits on migration capacity, and migration speed is related to the size of the data being migrated; it is equivalent to the copy speed in Windows.

4. Can I check the new partition with a Windows tool?

The newly created migration partition can be edited using Disk Management.

Download Partition Master Tool for Free:

Step-by-step guide on how to use the feature:

Step 1: Launch AOMEI Partition Assistant, enter the "Partition Management" interface, right-click on C drive, and choose "Migrate OS".

Step 2: Select the data you want to migrate, then click “Next” to continue.

Step 3. Select the target partition to which you want to migrate, and click Start to perform the task.

Step 4. When you're done, you'll have more free space on your C drive.

You may also like:

How to Increase C Drive Space in Windows 11

How to extend C drive in Windows 11? This page teaches you 3 methods to increase C drive space in Windows 11.

Another manual method in Windows 10/11: Extending C drive with DiskPart

Note: This is not about extending the C drive from another disk. Back up your data first in case of data loss.

Diskpart can also help you get more space on your C: drive, but only under certain circumstances: If you have only one partition on the disk and no unallocated space following it, you'll need to use a tool like Partition Master to extend the system partition from another drive. If there's a partition right behind your C: drive, you can delete it with Diskpart to free up space for C:.

Step 1: Type “cmd” into the search bar. Right-click “cmd” and select “Run as administrator.”

Step 2: Type diskpart, and press Enter.

Step 3. Type in the command lines one by one and press Enter after each:

1. List disks 2. Select disk * (replace * with your system disk number, e.g., select disk 0) 3. List volumes 4. Select volume * (replace * with the partition number; back up important files on the volume first) 5. Delete volume 6. Select volume * (replace * with the disk number of the C drive) 7. Extend size=number (usually, the default unit is MB) 8. Exit

Then you can restart your computer, and your C drive will have more space.

Final Thoughts

In this guide, we introduce you to the magical partition software - AOMEI Partition Assistant. So, if you only have one system disk with no unallocated space to extend C drive, you can turn to the second disk (no external device required). This is the easiest method that we've tested. Hopefully, this tool will be of help to you.

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