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Create Bootable USB Without Any Software Using CMD

Updated by Gemma on Aug 26, 2021
Written by Jean

Since a bootable USB drive contains all essential system booting information and files, it can help boot and start a computer's operating system even when it's dead, which can be caused by corrupted system files, fatal hardware issues, black/blue screen of death, and many unpredictable reasons. We know that there are dozens of professional USB bootable creation tools online that are available to assist users to make bootable media in a much easier way. However, it's still quite useful to grasp the knowledge of using the Dikspart command to achieve the same goal.

Guide: use cmd to format and create a bootable USB drive

Note that the process of making your USB drive bootable will erase all data on the target drive completely. Remember to back up important files and data in advance.

Select an alternate solution to Step 1 when you wish to format a hard drive faster with third-party free hard drive formatting software

Step 1. Format the USB drive

1. In Windows 10, 8 or 7, press 'Windows + R' keys simultaneously to open the Run Dialog box, input cmd, and press Enter.

Or, just navigate to Start - All Programs - Accessories; right-click on the Command Prompt and select Run as Administrator.

2. In Command Prompt, type Diskpart and press Enter.

3. Type list disk. You'll see all the connected drives including the prepared USB hard drive, with additional information behind, such as the disk number, size, etc.

4. Then you should type select disk #. The # represents the number of your own USB hard drive. For example, mine is disk 1, so I type select disk 1.

5. Type the following commands one by one, and press Enter after each command.

  • clean
  • create partition primary
  • select partition 1
  • active
  • format fs=ntfs
    (it means you format the drive with NTFS file system)
  • assign
  • exit

Step 2. Copy files from a DVD to the USB drive

1. Insert a DVD from where you want to copy the data to create a bootable USB drive. Let's assume the DVD drive letter is E:.

2. Open Command Prompt in the same way, type the following commands one by one, and press Enter after each command.

  • E:
  • cd boot
  • bootsect /nt60 g: 
    (G: is your USB drive)
  • copy e:\*.* /s/e/f g:

Alternatively, you can copy the entire content of the OS from an ISO image to the USB manually.

To do this, go to the 'My Computer' window, right-click on the DVD drive where you put the ISO image, select Open to view the contents. Copy all the files and folders on the DVD to the USB drive. Congratulations, you've succeeded in creating a bootable USB without any software!

Conclusion: think about a bit more

That's the overall process to create a bootable USB hard drive using cmd. Apparently, this is an advanced approach for experienced users only. What about the majority who know little about CMD skills? Will they be able to handle the long list of steps, most importantly, without making mistakes? 

One software we'd like to recommend is EaseUS OS2Go. It is designed for users to create a portable Windows USB drive, support from Windows XP to the latest Windows 11. With simple clicks, you can put your own OS to a tiny USB stick then carry and use it to any device you want. You can use it on a Mac computer so that you can play Windows games on a Mac computer.

  Free Download

For Windows 11/10/8/7

Unique benefits

  • Skip the tedious procedure of formatting the USB hard drive and copying Windows installation.
  • Install personalized Windows OS that you're currently running to the USB drive.
  • Boot Windows OS from the drive on any computer.

EaseUS OS2Go

Make Your Own Windows Portable Drive with a Few Clicks!


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Step 1. Install EaseUS OS2Go on your Windows computer, it will display your system drive's used space. Plug in a USB drive that is larger than the system drive used space. Choose the target USB drive and click Next to continue.

how to use os2go step 1

Step 2. EaseUS OS2Go will notify you that the following operation would delete all data on your drive. Make sure that you have backed up all the important data. Click the Continue button to proceed.

how to use os2go step 2

Step 3. Adjust disk layout. The default disk layout on the target drive will be exactly the same as the resource drive. You could also edit the layout according to your needs. Tick the option there if you're using a Solid State Drive as the Windows bootable drive. Next, click Proceed.

how to use os2go step 3

Step 4. Then EaseUS OS2Go will start to create the portable USB drive. It usually takes a while depending on your OS and Network condition. When the progress reaches 100%, the USB drive should be bootable now.

how to use os2go step 4

Step 5. Insert the portable Windows USB and start your computer. Press the required key (F2, DEL, F10...) to access BIOS. Choose to boot from the USB disk.

Note: Please make sure that the boot mode (UEFI or Legacy) of the portable USB and your target computer are the same, otherwise you may not be able to boot.

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Updated by Gemma

Gemma is member of EaseUS team and has been committed to creating valuable content in fields about file recovery, partition management, and data backup etc for many years. She loves to help users solve various types of computer related issues.

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Written by Jean

Author Jean has been writing tech articles since she was graduated from university. She has been part of the EaseUS team for over 5 years. Her special focuses are data recovery, disk partitioning, data space optimization, data backup and Mac OS. By the way, she's an aviation fan!

Read full bio

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