There are certain times you need to use an Operating System but you don’t want to overwrite you existing OS or make your machine slow by going for a parallel boot option.
In such a case the best option is to use a bootable USB drive.
All you need to do is set your first preference to USB drive/HDD in the BIOS setup. Insert a bootable USB drive and viola! Your computer runs at the same fast speed and there’s a new OS in the machine without even installing it!
Its probably the easiest thing to do in a computer other than double click the MyComputer shortcut on your desktop.
I will guide you through the steps with screenshots.
Pre-requisites:
1. UNetbootin
2. A USB drive big enough to hold the OS you need. In my case I need a 4GB drive for Backtrack 5 R3.
Step 1: Download UNetbootin here .Its not a large file. 4.6 MB.
Step 2:Connect your USB drive to the computer.
Step 3: Run UNetbootin from wherever you have saved it.
This is what you will see:
Step 4: The way I go about it, I use the diskimage method. Click on the radio button next to Diskimage. Next, click the ellipsis to browse and put the ISO file of your OS here. Choose the USB drive which has to be made bootable too.Looks like this once you’ve loaded the ISO file’s path and chosen the drive:
Step 5: Press OK and wait a little while. The setup will say you’re good to go soon.
Step 6: Shut down your computer,restart it, press F12 or whatever key it is that opens the BIOS setup (Different key for different computers, its generally F12).
Step 7: Go to boot options in the setup and get USB HDD to the top in the preference column.
Step 8: Save and exit.
Step 9: Connect your USB drive, shutdown the computer and restart it with the USB connected.
The bootable drive now works perfectly.
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