How to create a bootable usb for windows 7/8.1/10

To create a bootable USB drive manually, we will use the Command Prompt it is best way to make usb bootable  as a Windows default program. Here are step by step to create a bootable USB drive as the Windows installation media. To create a bootable USB drive as a Windows installation media, we require at least 4 GB for minimum capacity. Larger capacity is better. At this moment, I use the USB flash drive with 2 GB of capacity as just an example. It's due to some reasons that my 4 GB flash drive encountered an unusual problem that i have to fix later. :D and you have to use usb according to the size of windows if your windows is of 8 Gb than you have to have 16GB of usb to install the windows .

Step 1: Using DISKPART Command

1. Insert your USB flash drive in your computer. As the first step, we need to run Command Prompt as administrator. To do this, we need to find cmd by typing 'cmd' in the search box on Windows Start Menu. After search result for 'cmd' appears, right click on it and select "Run as administrator".
2. Type 'diskpart' on Command Prompt (without quotes) and hit Enter. Wait for a while until the DISKPART program run.
3. Type 'list disk' to view active disks on your computer and hit Enter. There would be seen that the active disks shown as Disk 0 for hard drive and Disk 1 for your USB flashdrive with its total capacity.
4. Type 'select disk 1' to determine that disk 1 would be processed in the next step then hit Enter.
5. Type 'clean' and hit Enter to remove all of data in the drive.
6. Type 'create partition primary' and hit Enter. Creating a primary partition and further recognized by Windows as 'partition 1'.
7. Type 'select partition 1' an hit Enter. Choosing the 'partition 1' for setting up it as an active partition.
8. Type 'active' and hit Enter. Activating current partition.
9. Type 'format fs=ntfs quick' and hit Enter. Formatting current partition as NTFS file system quickly.
10. Type 'exit' and hit Enter. Leaving DISKPART program but don't close the Command Prompt instead. We would still need it for next process.

Step 2: Creating Boot Sector

Let us consider that the flash / USB drive is the D: drive and the DVD installer located on drive F :. The first step, we will navigate Command Prompt to set installation DVD as its active directory.

1. By default, Command Prompt's active directory for Administrator permission is on C:\Windows\System32>. We will navigate Command Prompt to set on DVD (F:) as its active directory. Just type 'f:' then hit Enter, and the active directory changed to F:.
2. Type 'cd boot' and hit Enter. Active directory changed to F:\boot>.
3. Type 'bootsect /nt60 d:' and hit Enter. Creating boot sector on D: drive (USB flash drive).
4. Type 'exit' and hit Enter to close the Command Prompt.

Step 3: Copying Installation Files

guys you can either  copy windows directly from your dvd to your usb drive but if you want you can also try that one.

To install Windows from a bootable USB drive, we just need to copy the whole installation files contained on the DVD installer to flash drive. To do this, open the Command Prompt as in previous steps. Once it opens, type 'xcopy f: \ *. * d: \ / E / H / F' and then press Enter. Wait until all the files in the DVD installer copied to the flash drive. Now bootable USB drive is ready to be used for installing Windows from flash drive and you're done !