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We have been using CDs and DVDs to install operating systems on our computers for quite some time now. With the ever increasing popularity of netbooks, things are about to change. In such cases, an external optical drive or a USB drive is required.
There are a few situations where the use of USB drive brings a certain benefit:
(1)When you want to create a live USB from an ISO image
(2)You can protect your original install media from wear and tear.
(3)When you are trying to install Windows on a netbook or your optical drive is broken.
For starters, not every PC is capable of booting from a USB flash drive. For the most part, computers manufactured within the last two years are generally able to boot from a flash drive.The pen drive capacity must be a minimum of 4 gb.
Now the following are the steps required to install windows using a bootable USB:
(1)First install the boot files onto it by following either of these methods.
- Using Windows 7 USB creator tool :How to create bootable USB Windows 7
- Manually : How to create bootable Windows 7 USB manually
(2)The next thing that you must do is to configure your PC to allow you to boot from the flash drive. This is all done through the computer’s BIOS Setup.
(3)You can access your computer’s BIOS by pressing a specific key immediately after you turn the PC on. The key varies, but it is usually either [F1], [F2], [Delete].
(4)Once you are in the BIOS Setup, you should verify that all of your computer’s USB options are enabled. This might include things like support for legacy USB devices or support for USB 2.0.
(5)If there is a time out setting for USB devices, you should set it to the max to insure that the system doesn’t time out while waiting on the USB device to boot.
(6)Next, find the section on boot device priority. Normally, a USB flash drive (which is usually listed as USB-HDD, but may be listed as a removable device) will have a very low boot priority.
(7)If the USB flash drive’s boot priority is lower than the hard disk (listed as HDD) then the only time the computer would ever boot off of the USB flash drive is if the system were to fail to boot from the hard disk. You must therefore rearrange the boot device priority so that the flash drive has a higher priority than the hard drive.
(8)After configuring the PC reboot the system and insert the USB pendrive onto which the boot files are created and install the new WINDOWS 7.
Resource: http://www.comptalks.com/how-to-install-windows-7-using-bootable-usb-drive/
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