I recently loaded Windows 7 on my netbook computer and ran across a tool named “Windows 7 USB/DVD Download Tool” which makes creating a Windows 7 bootable USB flash drive much easier. Download and install this tool.
Open the program and select the ISO you want to copy to your USB flash drive.
Select the USB flash drive you want to copy the Windows 7 installation media to. Warning: This process erases all data that currently exists on the USB flash drive you select. You will need a 4GB or larger USB flash drive for Windows 7. Select “Begin copying”:
Now that was much easier than using DiskPart.
I’ve confirmed that this program runs on Windows 8 and this process works without issue to create a bootable Windows 8 RTM USB drive.