HOW TO CREATE A BOOTABLE USB DRIVE WITHOUT ANY SOFTWARE

If your system have no CD or DVD room but you have to format your PC then this information is dedicated to you. Here I will show how to make bootable USB drive manually. In this tutorial we are going to use command prompt which is the default program available in every windows operating system.
What we need to create bootable USB drive.?
first and important thing is, we need at least 4 GB disk space capacity usb drive. If we have more than 4GB disk space USB drive then it would better for us.

Lets start step by step

1. Insert your USB flash drive in to your computer.
2. Open command prompt. for this you can press control+R and type 'cmd' in the search box. select it, press right key and click on Run as administrator.
3. You will see new window of command prompt. Type DISKPART without quotes and press enter.
4. Wait for a while until the DISKPART program run. After this type 'list disk'. This will show you the active disks on your computer and press enter. Note that Disk ) is for hard drive and Disk 1 fro USB flashdrive. This will show your USB flash drive with full capacity.
5. Now type 'select disk 1' and press enter.
6. Type 'clean' and again press enter. This time all data available on your USB flash drive would be removed permanently.
7. Type 'create partition primary' and again press enter. In this process windows creates the primary partition which will recognize by windows as partition 1.
8. Type 'select partition 1' and again press enter. This will chose 'partition 1' to set up as an active partition.
9. Type 'active' and press enter. This will activated your current partition.
10. Type 'format fs=ntfs quick' and press enter. This process will format your current partition as NTFS file system quickly.
11. Type 'exit' and click on enter. Here you came back from DISKPART program. Note: do not close the command prompt, because you have to do other task being here.

Creating Boot Sector

1. Consider your USB flash drive is D: drive and DVD drive is F:. Now you have to navigate Command Prompt to set installation DVD as its active directory.
2. Here you will notice that C:\Windows\System32>  is the default command prompt's active directory for administrator permission. Here you have to do is to navigate command prompt to set on DVD(F)  as its active directory. For this type 'f': and press enter. Now your active directory is changed to f.
3. Type 'cd boot' and click on Enter. Here your active directory is changed to F:\boot>
4. Type 'bootsect/nt60d:' and hit enter. This will create boot sector on D: drive which is USB flash drive.
5. Type 'exit' and click on enter. Now your command prompt is closed. and congratulation for making bootable USB drive successfully. Now you can youse this USB flas drive as a boot media.

Copying Installation Files

1. The main task is to install windows from bootable USB drive. for this you have to copy entire installation files to the USB flash drive. For this open the Command Prompt by repeating the previous procedure. 
2. After opening it, just type 'xcopy f: \ *. * d: \ / E / H / F' and click on enter .
3. Your almost all task to make installing windows from flash drive is done but wait till entire installation file is copyed to USB flash drive from DVD installer.
4. Now your USB flash drive is ready to format any PC.