METHOD 1: HOW TO CREATE A BOOTABLE USB FLASH DRIVE.

HOW TO MAKE USB FLASH DRIVE (DISK) BOOTABLE! START WINDOWS FROM THE USB.

Method 1: Using Command Prompt.

Requirements!

• Bootable Windows DVD If you don't have a bootable DVD start by downloading a bootable copy of windows ISO and burn it to a blank DVD using softwares such as Nero, Ashampoo, Alcohol, or windows image burner. Once you have a bootable DVD, then proceed as follows.
• USB flash disk (drive) of 4GB or more.

Insert the bootable windows DVD and flash drive into the computer.

In windows start menu, search "cmd" and right click, select run as an administrator, see the screenshots. 

1. Type 'diskpart' on Command Prompt (don't use the quotes) and hit Enter. Wait for a while until the DISKPART program run.
2. Type 'list disk' to view the available 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 flash disk with its total capacity. Take care: note the disk you want to program!
3. Type 'select disk 1' to determine that disk 1 would be processed in the next step then hit Enter. This is your flash!
4. Type 'clean' and hit Enter to delete all of data in the drive.
5. Type 'create partition primary' and hit Enter.
6. Type 'select partition 1' an hit Enter.
7. Type 'active' and hit Enter.
8. Type 'FORMAT FS=NTFS QUICK' and hit Enter.
9. Type 'exit' and hit Enter. Leaving DISKPART. Don't close the CMD. We would still need it for next process.

Creating Boot Sector

Let us assume that the flash disk is the H: and the DVD installer located on drive F:

1. Type 'CD BOOT' and hit Enter. Active directory changed to F:\boot>.
2. Type 'BOOTSECT.EXE /NT60 H:' and hit Enter. H is your flash drive.
3. Type 'exit' and hit Enter to close the Command Prompt. Until this step we have made a bootable USB drive successfully, and the flash drive is ready to be used as a boot media.

Copy the installation files from your DVD or any other windows files source apart from windows XP files to the flash drive. You can now use this flash drive to boot as many PCs as possible. It is very fast to use flash drives to format or install windows than using DVD.

 Check the next post for method 2: It is easy!

Enjoy...!