Clean C Drive without Formatting in Windows 10/8/7 [Tested & Worked]

This page provides reliable solutions for you to clean C drive and even delete system C drive, follow to see how can you clean or delete your system C drive in Windows 10/8/7 on your own now:

How to Clean C Drive without Formatting Windows 10/8/7

When the computer or Windows system has been running for a very long period, many useless junk files will be left over in the system C drive. With more and more leftover files accumulating, the computer becomes slower and slower.

So how to resolve this problem? The best and most straightforward solution towards this issue is to clean the C drive. Some people may come up with the solution to format C drive. But Windows computer won’t allow you to format the system C drive. Huge file loss or even system error would occur if you do so. 
Here in the below, we’ve gathered two tested and effective methods for you to apply and clean C drive without formatting in Windows 10, 8 and even 7:

Method 1. Run Disk Cleanup utility to clean C drive

1. Open This PC/My Computer, right-click on C drive and select Properties.

2. Click Disk Cleanup and select files that you want to delete from C drive.

3. Click OK to confirm the operation.

Method 2. Run partition manager software to clean up C drive without formatting

You’ll see that Disk Cleanup utility can only remove some temp files and Recycle Bin files on your computer. If you want to remove more Windows built-in application junk files or large files in Windows 10/8/7, you’ll need to turn on another powerful partition manager software for help.

To remove all useless files and even large files from your C drive, we’d like to recommend you try free partition manager software - EaseUS Partition Master Free Edition. 
It’s 100% free and risk-free for optimizing computer performance with its Cleanup and Optimization feature. You may directly download and install it on your PC, following guidelines below to clean up your C drive without formatting now:

 

Step 1: Launch EaseUS Partition Master. Select "Tools" and click "System Optimization".

Step 2: Click "Junk File Cleanup". Then you can click "Analyze" to let EaseUS Partition Master find junk files on your PC.

Step 3: You can check and choose junk files and click Clean up. All of the selected junk files will be cleaned and deleted from your PC. Click "Yes" to clean up junk files.

After this, you’ll get a clean but faster-running speed on your computer. 

Delete system C drive without formatting? (Delete OS on HDD/SSD)

Besides cleaning or clearing C drive, some other Windows users are even thinking to delete system C drive (OS partition) from HDD or SSD without formatting. But why do these people want to do so? And how to do it?

Here is a list of reasons why Windows users want to delete a system drive from a Windows computer, and if you are one of them, don’t worry. You’ll find a solution here:

1. 1. To perform a clean install of Windows 10/8/7: wipe all data on the system disk is necessary, especially to delete the system drive.
2. 2. To delete system drive on old HDD after system cloning to a new HDD/SSD.
3. 3. To delete system C drive on target disk when the OS migration process failed or halted.
4. ...

How to delete system C drive without formatting? To do this, we’d like you to apply professional partition manager software - EaseUS Partition Master Pro for help.
This software can do the job that other Windows built-in tools or third-party software can’t do: to directly delete system C drive and partitions on your Windows disk with a created WinPE bootable disk. 

You can directly activate it into a full version and apply it to below guidelines to delete the system C drive with ease now:

 

Step 1: Prepare a disc or drive

To create a bootable disk of EaseUS Partition Master, you should prepare a storage media, like a USB drive, flash drive or a CD/DVD disc. Correctly connect the drive to your computer.

Launch EaseUS Partition Master, go to the "WinPE Creator" feature on the top. Click on it.

Step 2: Create EaseUS Partition Master bootable drive

You can choose the USB or CD/DVD when the drive is available. However, if you do not have a storage device at hand, you can also save the ISO file to a local drive, and later burn it to a storage media. Once made the option, click "Proceed".

Step 3: Reboot PC from bootable disk

Reboot your PC from EaseUS Partition Master WinPE bootable disk and enter EaseUS Parition Master.

Step 4: Select partitoin to delete

On the main window, right-click on the hard drive partition which you want to delete and select "Delete".

Step 5: Confirm the deletion

Click "OK" to confirm that you want to delete the selected partition.

Step 6: Execute to delete the partition

Click the "Execute Operation" button at the top corner and keep all changes by clicking "Apply".

Note: If you’ve deleted the system C drive on your current running computer, you’ll not be able to run or boot up Windows system anymore. You can refer to clean install Windows 10, 8 or 7 for tutorial help.