Create a bootable USB without any third party software

First of all open command prompt and type diskpart and press Enter. It will take u to the another window look like  the below

After that u have to type list disk and Enter u will get the available list of disk.like

After u have to use some commands like bellows:

First of select the disk by select disk 1      Enter

After this Clean the disk by typing clean command.

create a partition by create partition primary and Enter

after this select Partition by select partition 1 command

 

And when u complete these steps

Use commands to make is Active by active command

And the format it in NTFS Format format fs=ntfs quick

Assign it a drive letter by command assign 

after the successful completion of these command u got your pendrive that is ready to boot.

thanks for readings....