The OS (system) cloning software, as its name implies, is to clone the original operating system from one disk to another storage device such as a hard disk drive (HDD), solid-state drive (SSD) or other external hard drives. Thus, you will need a proper system cloning tool. Suffer from OS running slow or failing and want to clone the old hard drive to a new HDD or SSD? Buy a new computer and want to enjoy the OS environment on the old one? Plan to make a system backup in case of unexpected disasters? In either situation, you can clone the OS to the destination location without reinstalling Windows 10 system & installed applications. So anyone can tell how can I copy OS from one drive to another? Or is there any great OS cloning software? Thanks!' But I have never done this (copying OS from one drive to another) before. So I bought a new SDD hoping that I would be able to clone the OS from the failing hard drive to it. 'My Windows 10 OS runs on a SanDisk HDD, but it begins to fail. Steps to clone just OS from one hard drive to another.