The sources pointed out that the current procedure of installing the Windows operating system into a hard drive is much easier for their assembly lines, and a production line can easily manufacture 1,000 PC units in a very short time. However, if Microsoft changes its install method for Windows 8, it will require a longer time to install as each machine will need individual time to attend, while sticking a COA label onto a PC will help technicians identify the machines that have already been installed with an operating system. Without the label, it could easily create installation overlap and generate higher cost and yield rate issues to ODMs as Microsoft is charging the fee through the number of times of installation.