▶Copy OS partition to a smaller hard drive as long as the available space on the destination disk is equal to, or larger than the used space of the current OS partition or disk.
Its "Migrate OS to SSD Wizard" can clone Windows 11/10/8/7 OS from one drive to another hard drive (HDD or SSD). This software is completely free without any bundled software.
If you have no idea how to identify a reliable OS cloning utility, you can try AOMEI Partition Assistant Standard. Then you can obviate the need to reinstall OS from scratch, which can be a tedious process especially when the Windows activation keys are not available any longer. 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 proper OS cloning software. 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 free OS clone 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.