[Fixed] We Couldn't Create a New Partition or Locate an Existing One

Daisy updated on Jan 09, 2020 to Partition Master | How-to Articles

"We couldn't create a new partition or locate an existing one. For more information, see the Setup log files".

we couldn't create a new partition or locate an existing one error

Such an error would probably occur when people try to clean install the second OS using the bootable USB drive, to dual boot Windows 10 with Windows 7 or Windows 8. By choosing custom install and selecting the drive where the OS supposed to install, Windows says it couldn't create a new partition or locate an existing one.


How to Correctly Clean Install>>

Step 1. Download the media creation tool from Microsoft and choose 32-bit or 64-bit for your PC, then the compatible one will run automatically.

Step 2. Run the downloaded tool and choose to Create installations media for another PC and click "Next".

Step 3. Select "Language, Edition, and Architecture for Windows 10" and then click "Next".

Step ...


To fix "We couldn't create a new partition or locate an existing one" trouble, give the following solutions a try:

Solution 1: Disconnect any peripherals with PC/Laptop

When you encountered this error message, it's probably because there are some peripherals connected, such as an external HDD, SSD, USB thumb drive/flash drive or an SD card. Just remove and disconnect all external storage drive from the USB port. If you're using USB drive containing setup files to install OS, reconnect only the bootable USB drive and start again.

Solution 2: Run Diskpart

Sometimes you need to take further steps to fix "we couldn't create a new partition or locate an existing one" error. Generally, the partition that holds Windows setup files and boot files should be set as primary, which requires the help of Dskpart in Windows. About how to start and run diskpart to fix the issue, please follow the guide carefully.

Step 1: Start Windows 10/8.1/8/7/XP/Vista setup using bootable USB or DVD.

Step 2: If you get "We couldn’t create a new partition" error message, close the setup and click the "Repair" button.

Step 3: Choose "Advanced tools" and then select "Command Prompt".

Step 4: When Command Prompt opens, enter start diskpart.

Step 5: Now enter list disk. You should see the list of all hard drives connected to your computer.

Step 6: Find the number that represents your hard drive and then enter select disk 0 (we used 0 as an example, so be sure to replace 0 with a number that matches your hard drive).

Step 7: Enter the following lines and press Enter after each line:

disk 0 clean
disk 0 create partition primary
disk 0 active
disk 0 format fs=ntfs quick
disk 0 assign

Step 8: Enter exit in order to close the Command Prompt.

Step 9: Start the installation process again.

Solution 3: Make partition active

Repeat the steps (1-4) above to open diskpart first. Run diskpart commands we taught as below, and try to set the partition where you want to install Windows OS as active.

Step 1: Enter list disk.

Step 2: You should see the list of available hard drives. Locate your hard drive and enter select disk 0. We used disk 0 in our example, so be sure to replace 0 with a number that represents your hard drive.

Step 3: Enter list partition.

Step 4: List of available partitions will appear. Locate the partition on which you want to install the Windows system and enter select partition 1. Remember to replace 1 with a number that matches your partition.

Step 5: Enter active.

fix we couldn't create a new partition or locate an exising one using diskpart

Step 6: Type exit and press "Enter“ to exit the Command Prompt.

Diskpart is somewhat complex to operate, users should be careful to apply it. If you want to avoid any mistake, turn to diskpart alternative - a third-party disk & partition manager software, which supports to convert simple/logic volume to the primary partition and set the desired partition active.

Download Now

 Windows 10 is supported

It's simple & powerful in solving "we couldn't create a new partition or locate an existing one" error by setting desired partition primary & active. Just download and launch EaseUS partition manager software. On the disk map, right-click the desired partition and choose "set active". The software will automatically execute the operation and create an active partition for you.

set active

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Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

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