To transfer OS to new drive with the help of OS migration software, you can keep system files and personal data intact. ▸Another important reason of migrating Windows OS is to save time and effort of reinstalling and re-configuring systems and applications which are required in a clean instalkl. Moving OS to new hard drive from the old one helps you avoid reinstalling operating system and personal applications. ▸The system hard drive is about to fail due to overload, service time limitation, virus, or other unknown reasons. ▸The Windows operating system is installed on a hard disk drive (HDD) and you want use SSD for OS and HDD for storage when an SSD is available. It’s not a bad choice to move OS to a large disk and use the old one as a secondary device. ▸After years of usage, the available storage space of your hard drive can decrease and trigger the low disk space issue. You may want to move Windows operating system to new HDD or SSD out of different reasons: