By Bryce / Last Updated June 30, 2020

Why clone OS drive?

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. That can help you to migrate OS to a new hard drive without reinstallation.

When Windows is running slowly, it’s wise to replace HDD with SSD. Due to SSD’s high price, the capacity of SSD usually is smaller than the capacity of HDD. When the newly purchased SSD isn’t large enough to hold all things in the source disk, it’s not a bad idea to clone OS partition (data partition not included).
Or you clone Windows OS drive to another place is just to make a duplicate of current OS drive just in case of operating system crash when some events like virus infection happen.

How to: clone OS drive step-by-step

To clone OS partition safely and quickly, it is important to find out reliable and professional drive cloning software. AOMEI Partition Assistant Professional would be my first choice. It allows you to clone Windows OS drive to SSD or HDD of different sizes and can align partition automatically during the cloning process. It can work well under Windows 10/8.1/8/7, XP, and Vista. To clone Windows Server 2019/2016/2012 (R2)/2008 (R2)/2003, you can employ AOMEI Partition Assistant Server.

Now, you can free download the demo version of AOMEI Partition Assistant Professional to have a try!

Have a look at the following preparation work:

▪ 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 the current OS partition.
Defragging HDD is advised before you transfer OS partition from HDD to SSD (omissable).

Then, you can do as the steps given below to copy Windows OS partition to SSD (Take cloning OS drive to SSD in Windows 10 as an example).

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 from the 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 Proceed to commit operation.



Final words

How easy 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 to disk/partition. Such as, when you converted your basic disk into dynamic accidentally, 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.