In order for a computer to boot from a USB drive, the BIOS must support it. If it does not, you will need to find an upgrade for your BIOS. In most cases, the support for USB booting will never be available for systems that didn't support it to begin with.
bootable USB guide, here we assume that you are using either Vista or Windows 7 to create a bootable USB.
Insert your USB (4GB+ preferable) stick to the system and backup all
the data from the USB as we are going to format the USB to make it as
2. Open elevated Command Prompt. To do this, type in CMD in
Start menu search field and hit Ctrl + Shift + Enter. Alternatively,
navigate to Start > All programs >Accessories > right click on
Command Prompt and select run as administrator.
3. When the Command Prompt opens, enter the following command:
DISKPART and hit enter.
LIST DISK and hit enter.
you enter the LIST DISK command, it will show the disk number of your
USB drive. In the below image my USB drive disk no is Disk 1.
this step you need to enter all the below commands one by one and hit
enter. As these commands are self explanatory, you can easily guess what
these commands do.
SELECT DISK 1 (Replace DISK 1 with your disk number)
CREATE PARTITION PRIMARY
SELECT PARTITION 1
(Format process may take few seconds)
Don't close the command prompt as we need to execute one more command at the next step. Just minimize it.
Insert your Windows DVD in the optical drive and note down the drive
letter of the optical drive and USB media. Here I use "D" as my optical
(DVD) drive letter and "H" as my USB drive letter.
6. Go back to command prompt and execute the following commands:
D:CD BOOT and hit enter. Where "D" is your DVD drive letter.
CD BOOT and hit enter to see the below message.
(Where "H" is your USB drive letter)
7. Copy Windows DVD contents to USB.
are done with your bootable USB. You can now use this bootable USB as
bootable DVD on any computer that comes with USB boot feature (most of
the current motherboards support this feature).
Note that this bootable USB guide will not work if you are trying to make a bootable USB on XP computer.