Let us consider a situation that we need to to create a bootable USB flash drive Windows 8, since to date, this option is the transfer of the image of the operating system and installing the OS, it is the best option.
As a program that will allow us to create a bootable USB-stick, we will use the UltraISO, because this program is: a fairly simple interface, numerous options and boasts of its free version, which is very convenient.
1. You need to make download and installation UltraISO program.
2. You need a license to download a Windows 8 operating system.
3. You will need a standard USB-drive, which must have a minimum capacity of 4 GB., But it is better if the flash drive is a memory capacity of at least 8GB.
4. When all of the above you have, just make a USB-drive connection to the computer and run the program UltraISO. Note that UltraISO program starts immediately in the imaging mode and window depending on the version you are using, it will look something like this: 
Now, you need to make the choice of the downloaded ISO image of Windows 8: 
In the next step you need to select "Bootstrapping" -> "Burn hard disk image".
In addition, here you can make a variety of USB-drive (if more than one at a time is inserted into the computer), format the USB flash drive to choose while recording method «USB-HDD +» (if you yourself do not format the USB flash drive, then it will do the program so it is first necessary to move all the data you need a USB-drive on your computer). 
The last step for you will press the button "Record" and confirm formatting the stick, because after this action, you will have to just wait until the program finishes recording of the Windows operating system image to removable media. 
As soon as the recording process is complete, you will see a message from the program and realize that you could to create a bootable USB flash drive Windows 8.
After the work done with the program, you can practically minutely begin installing a new operating system that will allow you to save a lot of time and effort.
Just a removable USB-drive is much more practical than a DVD-ROM, because its dimensions are more compact and installing from a USB drive is much faster than from disk.
