how to make bootable pendrive for windows from iso file

If you have an old USB drive lying around that you don't use anymore, you can turn it into an operating install disk for Windows, Linux or Mac, or turn it into a diagnostic tool for your PC. To make a USB bootable, you'll likely need to tweak and format the USB drive in a manner according to the specific operating system or purpose you have in mind.

If you are facing the problem while creating Bootable Pendrive. Here is the very easiest method to create Bootable Pendrive from iso file. We need to create bootable Pendrive of installing windows in your system without CD/DVD. You can use Pendrive for installing windows on your computer. Every day many people try to make bootable Pendrive, but not get success.

You know Why
Because on the web, everybody tells about Run command to make bootable pen drive.

Command method is very hard to create bootable Pendrive for a beginner. Every user doesn’t know, he is using command is right or wrong , some users fails to create bootable Pendrive because they properly not follow the command.

Before begin, the process makes sure you have Windows iso file and Minimum 4GB storage Pendrive. If you don’t have .iso file then take it. You can use Nero software for making .iso file from CD/DVD.

► What is Bootable Pen drive?

Bootable pen drive is a method to install windows in your system through pen drive, after doing this you can easily use your pen drive for installing the operating system.

A common use of a bootable USB flash drive is to use it to boot into Windows. Booting from removable media such as a USB drive allows you to perform diagnostics on a computer that is having trouble booting from the hard drive. You can also use the flash drive to install Windows, instead of using the Windows installation CD.

► Why is it necessary to make a CD/pendrive bootable (using a converter) before using it to install an operating system?

► Why won't simply copying OS files into CD/Pendrive won't work. We have to convert it to a bootable CD/Pendrive to successfully install an OS through it.

-For this you need to understand the boot process. Below is the boot process simplified.

1. BIOS selects the disk which is set as the first priority for boot.
2. Now, this disk's first sector should contain the MBR (Master Boot Record) which also contains a "Boot flag". If this flag is 1 then it means the device is bootable and also that MBR is valid.
3. Now MBR points to the location of bootloader (i.e. NTLDR (in WinXP), bootmgr (in WinVista/Win8/Win10), GRUB in Linux). Then this bootloader is run. This is Stage 1 Boot.
4. After this, the bootloader reads the boot configuration and lists out all the available OS in the disk. Once, selected it loads the OS components (kernel, memory manager, cache managers etc.) and proceeds further till user login. This is Stage 2 Boot.
5. If BIOS is unable to find a valid MBR in first boot device it proceeds further to next device.

If we simply copy all the OS files into a USB/CD we are ready for Stage 2 boot but we haven't placed the MBR. That's why we need special tools to place this MBR so that BIOS recognizes the USB/CD as a bootable device and starts Stage 1 boot.

in this video i used RUFUS to make bootable pendrive. you can download RUFUS from https://rufus.akeo.ie/

overview of Rufus

- System Requirements:

Windows XP or later, 32 or 64 bit doesn't matter. Once downloaded, the application is ready to use.

- Notes on DOS support:

If you create a DOS bootable drive and use a non-US keyboard, Rufus will attempt to select a keyboard layout according to the locale of your system. In that case, FreeDOS, which is the default selection, is recommended over MS-DOS, as it supports more keyboard layouts.

- Notes on ISO Support:

All versions of Rufus since v1.1.0 allow the creation of a bootable USB from an ISO image (.iso).

Creating an ISO image from a physical disc or from a set of files is very easy to do however, through the use of a CD burning application, such as the freely available CDBurnerXP or ImgBurn.

- Notes on UEFI & GPT support:

Since version 1.3.2, Rufus support UEFI as well as GPT for installation media, meaning that it will allow you to install Windows 7, Windows 8 or Linux in full EFI mode.
However, Windows Vista or later is required for full UEFI/GPT support. Because of OS limitations, Windows XP restricts the creation of UEFI bootable drives to MBR mode.