By Bryce / Last Updated September 2, 2019

Clone OS drive under different situations

Cloning operating system drive means copying all things of C drive including operating system, system reserved partition, installed applications on C drive and personal settings. And you may choose to perform this operation under the following conditions:

  • Upgrade to SSD: When your computer is running at low speed, the first idea that occurs to you to purchase an SSD and take it as a boot disk, the old HDD as storage disk. Due to SSD’s high price, the capacity of the SSD usually is smaller than the capacity of HDD. Cloning only C drive from HDD to SSD rather than cloning entire disk requires less in destination SSD capacity.

  • Replace with larger hard drive: After upgrading to Windows 10, you are likely to find that the C drive is almost full. At this time, replacing the old hard drive with a larger one is not a bad choice. If you don’t want to reinstall Windows operating system, you can choose to clone Windows 10 drive from old disk to larger one.

Sometimes, you also copy OS partition to another place just in case of operating system crash when some events like virus infection happen.

How to clone/ transfer OS drive?

To clone or migrate operating system partition safely and quickly, it is important to find out reliable and professional OS cloning software. AOMEI Partition Assistant Professional is such software, even allowing you to clone Windows 10 to smaller SSD. It is especially designed for Windows system, thus you can employ it whether you are Windows 10 or other Windows operating system user. Let’s see how it works (Take cloning OS drive to SSD in Windows 10 as an example):

Before you do:

  • Connect the SSD to your Windows 10 based computer. For laptop users, a USB-SATA connection cable might be necessary.

  • Ensure that the unallocated space of SSD is not smaller than the used space of current OS partition.

  • Defragging HDD is advised before you transfer OS partition from HDD to SSD.

Clone OS partition to SSD step by step

Step 1. Install and run AOMEI Partition Assistant Professional. Click on Migrate OS to SSD on the left corner and click Next.

Migrate Os To Ssd

Step 2. Select an unallocated space on the SSD as the destination location and click Next.

Select Space On Ssd

PS.: If there is no unallocated space on the destination disk, it will ask you to delete all partitions on the disk. If you don’t want to delete all partitions on the selected disk, you can create an unallocated space in advance.

Step 3. Here you can resize the OS partition and change drive letter. Then, click on Next.

Resize Partition

A Note on how to boot Windows 10 from cloned SSD will pop up. Remember it in mind and click Finish.


Step 4. Here you can review the result of copying Windows 10 OS drive. After confirmation, click Apply and Proceedto commit operation.



  • A reboot is necessary as this operation is performed under PreOS environment.

  • It is available to copy data partition or clone disk to SSD/HDD via AOMEI Partition Assistant Professional.

  • You’ll be required to change boot mode between Legacy and UEFI if you migrate OS drive from MBR to GPT or GPT to MBR.

Final words

How easily it is to clone OS drive to another hard drive using AOMEI Partition Assistant Professional! In fact, this all-round software can assistant you to solve many other problems related with disk/partition. Such as, when you converted your basic diskinto dynamic accidently, it is able to convert the disk back to basic without dataloss. When you delete partition on external hard drive, it allows you recover the deleted partition easily.