Best Way to Transfer OS to New Hard Drive without Reinstalling in Windows 10/8/7

August 15, 2017

Want to transfer Windows OS to new hard drive without reinstalling? Yes, you can turn to professional OS migration software to move OS to new disk in Windows 10, 8, 7, XP, and Vista like a breeze.

Why do you want to transfer OS to new hard drive in Windows?

The performance of operating system (OS) in your laptop or PC may be affected by low disk space after years of usage. To transfer OS partition to new hard drive and use the old hard drive as a secondary storage device is a wise choice if you happen to own a new HDD. What's more, it is not uncommon to set SSD for OS and HDD for storage when an SSD is available.

Perhaps, the hard drive contains OS is about to failing due to overload, service time limitation, virus, or other unknown reasons. Move OS to new hard drive from the old one helps you avoid reinstalling operating system and personal applications. People who work with computer frequently has higher chance to transfer OS from old hard drive to new one to get efficient work outcome.

Another important reason of migrating Windows OS is to save time and effort of reinstalling and re-configure systems and applications comparing to clean install. To transfer OS to new drive with the help of OS migration software, you can keep system files and personal data intact. Whatever reasons in your mind, next step is to figure out how to transfer old OS to new hard drive.

How to migrate Windows OS to new HDD?

The new hard drive you hold must be formatted before you can use it right after you installed it in your machine. What should you do now? You can drag and drop some certain files to new drive in Windows Explore, such as the Documents, Music, Photos, or Videos folder. Yet you cannot drag and drop an operating system state to the new hard disk. Therefore, it is better to clone OS to new hard drive in Windows 10/8/7.

Turn to some professional software is a quick path under such circumstance. AOMEI Partition Assistant Standard is powerful and all-in-one partition management freeware for Windows 10/8/7/xp/vista. The one-button feature Migrate OS to HDD allows you to transfer OS and files to new hard drive within several clicks and to boot OS from the new drive successfully. Basic partition operations, like Resize/Move Partition, Merge Partitions, Copy Disk/Partitions, Create/Format/Delete Partition, Split Partition, etc are provided by AOMEI Partition Assistant. Download this freeware to copy entire OS to new hard drive in Windows environment.

Best way to transfer OS to new hard drive Windows 7

Step1.Connect the new hard drive to your computer. To transfer laptop OS to new hard drive, you may need a SATA-USB adapter. Install and open Partition Assistant Standard. Click Migrate OS to SSD in the left pane. Don’t be confused by its name because it can apply to HDD as well.

Migrate OS to SSD

Step2. Select the new hard drive here as the target disk.

Select the new drive

Step3. You can drag the double-headed arrow to resize system partition or just type the desire number in the box below.

Resize system partition

Step4. Make sure to read the Note in this window.


Step5. Click Apply to execute the pending operations.



  • This operation involves system partition, which requires it to be completed under PreOS mode.
  • To boot from the new hard drive, you need to set it as the first boot device in BIOS. Press F10 to save changes and exit.

  • The Standard version supports migrate OS from MBR to MBR disk. To transfer Windows OS between MBR and GPT disks, please turn to AOMEI Partition Assistant Professional.

  • AOMEI Partition Assistant also could assist you clone hard drive to hard drive entirely, no matter from larger disk to smaller or from smaller disk to larger.

Either to transfer OS to new hard drive out of upgrading old disk or out of replacing the failing one, AOMEI Partition Assistant Standard just let your hassle away. There has 490.34 GB unallocated space left on Disk 2 after system migration in the tutorial. If you have the same issue, you can refer to unallocated space after clone to make full use of them.

By the way, it is also the method of moving Windows OS to SSD from HDD as well. Except for aforementioned basic partition operations, Partition Assistant allows you to Create Bootable CD, Quick Partition used and unused hard drive, Command Line Partitioning for advanced users, Convert NTFS to FAT32, and vice versa.