How to create a bootable USB Flash drive

With the increasing trend of flash devices, CDs or DVDs are getting rare. Also, USB Flash devices such as pen drives are faster as compared to these magnetic disks. In order to install a new operating system to your system it is now a best practice to use a pen drive as compared to magnetic disks as pen drives are more efficient and easy to carry as compared to these round magnetic disks. In this tutorial we are going to reveal the method of creating a bootable USB flash drive at home without using any tool or third party software. Before start, you need to have following things with you.

A USB Flash Drive 4 GB or Higher

A system with Administrator Access

A disk image of operating system you are going to install either windows 7 or 8 and

Of course, this tutorial ;)

Now let’s start with the process of creating a bootable USB Flash drive. Follow these steps:

  • Plug in your USB Flash drive to your system and remove all the contents from it or simply format it.
  • Now in the search programs text box in start menu type “cmd”, right click the file and select “Run as Administrator”.
  • The command prompt window will appear, now you need to write the following commands in the command prompt.

C:\>  diskpart

After running this command the prompt will change from C:\> to DISKPART>

Now run the following command:

DISKPART> list disk

After running this command, the list of available disks will be displayed, from the available list choose your USB drive, you can recognize by its size.

DISKPART> select disk 1

After that you will be prompted with the following message:

Disk 1 is now the selected disk.

After that clean your selected disk by running the following command:


Then, you will be prompted with the following message.

DiskPart succeeded in cleaning the disk.Now create primary partition in your USB flash drive and then assign that partition to the USB drive by running the following commands:


DISKPART> create partition primary

DISKPART> select partition 1

DISKPART> active

DISKPART> format fs=ntfs

After the format is completed, run the following command:

DISKPART> assign

The message “DiskPart successfully assigned the drive letter or mount point.” Indicate the successful creation of bootable USB drive, but before continuing copying the Windows files to it, you need to perform following tasks.


After that the prompt will change to the C:\ drive again.


Now update the boot core in your USB flash drive by performing following steps

Locate the folder in which you have copied your windows files from image file by running the following command (suppose, you have located this in E drive with win 7 sp1 folder name):


E:\> cd win 7 sp1

E:\win 7 sp1>cd boot

E:\win 7 sp1 boot>bootsect.exe/nt60 h:

Where H is the drive letter of your USB flash device, it may change according to your system.


After that you’ll be prompted with the following message:

Target volumes will be updated with the BOOTMGR compatible bootcore.

This message indicates that you have successfully created a bootable USB flash drive, now close the command prompt.


After that you’ve to copy all the files from the windows folder to the USB flash drive. Now you can boot any windows system with this USB flash drive.

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