How do I extend C drive in Windows 10 PC without formatting?

Before you can extend the C drive in Windows 10 without formatting, you need to check if there’s unallocated space available adjacent to it (usually this would be on the right side of the C drive in Disk Management). This can be achieved through:

1. Right-click on the Start menu and select Disk Management. In the Disk Management window, look for the C drive and check for any unallocated space.

2. If there is no unallocated space available directly adjacent to the C drive, you may need to free up space. If you have another partition (like D:, E:, etc.) and want to shrink it to create unallocated space, you can do this:

• Right-click on the partition you want to shrink and select Shrink Volume.
• Follow the prompts to free up space.

3. Once you have unallocated space, right-click on the C drive and select Extend Volume. The Extend Volume Wizard will open. Click Next to proceed, select the amount of space you want to add to the C drive, or use the default maximum available space. And click Next, then Finish.

4. If you cannot click on the Extend Volume option, it usually means that the unallocated space is not directly next to the C drive. In this case, you can use third-party partition management software.

Before extending C drive in Windows 10 computer. Always a good idea to back up important files just in case anything goes sideways. If you want to free up some space before doing this, consider running Disk Cleanup. Just search for it in the start menu, and it'll help you get rid of unnecessary files. If you're worried about messing things up or if Windows' built-in tools don’t work for you, You can search for some well-known third party software on Google. Choose the one that works for you.

How to extend C drive in Windows 10 without formatting? Here are the steps:

1. First off, open up File Explorer, right-click on “This PC,” and select “Manage.” Then, go to “Disk Management” on the left side. Here, you can see all your disks and partitions. Check if there's any unallocated space next to your C drive.
   
   
2. If there's no unallocated space, you might need to shrink an adjacent partition (usually D or E) to create some free space. Right-click on that drive (like D drive), and click “Shrink Volume.” Choose how much space you want to shrink. Just make sure you don't take away too much if you still want to keep files on that drive.
   
   
3. Now that you have some unallocated space, right-click on your C drive and select “Extend Volume.” This will open a wizard to help you through the process. Just follow the prompts, and it'll let you choose how much of the unallocated space you want to add to C drive.
   
   
4. After you finish the wizard, your C drive should get that extra space. You can check by looking at the properties of the C drive again.

Windows' Disk Management can be pretty limited. For instance, you can only extend the C drive if there's unallocated space directly next to it. If your D drive (or any drive) is in between, you won't be able to extend C without some extra steps, like using third-party software.

If you're trying to extend C drive in Windows 10 without formatting, and you're changing other partitions, be careful. Sometimes, the setup can get confused, especially if you're shrinking a partition. Always ensure that the right partition is set as active. Before modifying partitions, run a disk check to ensure there are no file system errors. You can do this by opening Command Prompt (as admin) and typing chkdsk /f. Addressing any errors ahead of time can save you trouble later.