By Lucas / Last Updated August 10, 2022

About transferring OS to new hard drive in Windows

Sometimes, you may need to copy OS from the old hard drive to a larger new one spontaneously. Perhaps, it is a personal reason or a system's need. No matter which purpose you come from, it is always a waste of time to backup all the data or reinstall the OS. This brings you into a difficult circumstance.

The migration of OS cannot be done manually, because there're lots of hidden files and data you can't find, which only can be detected by professional software. Is there any reliable cloning software to copy the entire OS to a new hard drive without reinstalling it?

How to copy OS to a new hard drive via AOMEI Partition Assistant

Luckily, AOMEI Partition Assistant Professional is handy OS migrating software. Such a problem is a piece of cake with this disk manager software. Moreover, the Standard edition is free for home users and you can easily solve the problem completely.

It supports Windows XP/Vista/7/8/10. Now, Windows 11 has been released, this tool is also perfectly compatible with this latest Windows OS. With its simplified interface, even a computer novice can operate it.

There are 2 methods provided by AOMEI Partition Assistant.

No.1: "Migrate OS to SSD"
You can migrate OS from an MBR disk to another MBR disk, HDD and SSD are both available. Because this tool uses the hot clone way, users can migrate OS while it's running, and don't need to reboot the PC to complete that task.

No.2: "Disk Clone Wizard"
This function copies all data of the drive to another disk and the data on the target disk will be all erased. The new hard drive is a duplicate of the original one. All files and hidden files and settings will be the same as the source disk. Also, you don't need to reinstall your OS, just need to pay attention to the boot mode if the target disk is a GPT disk. You'll have two choices to do the disk clone:
Clone Disk Quickly
This way only clone the used space to the destination disk, and after the clone, you can adjust the size of partitions. If you need to clone an HDD to a smaller SSD, you can clone the utilized space. Because the drive contains both utilized and empty space, cloning solely used space will lower the occupied space without duplicating the unused space on the disk.
Sector-by-Sector Clone
In this way, you can clone all sectors on the source disk no matter used or not. If you need to clone a smaller HDD to a larger SSD or SSD of the same size, you may do so in this manner, and AOMEI will ensure the job's success even if there are blank sectors or logically faulty sectors.

Steps to copy OS to new hard drive in Windows

Now, let's see details to clone OS to a new hard drive with this free clone software. 

Download Pro Demo Win 11/10/8.1/8/7/XP
Secure Download

No 1. Migrate OS only to another disk

Step 1. Connect the SSD to your computer; install and run AOMEI Partition Assistant Standard; then, click "Migrate OS to SSD" and read the information.

Migrate OS to a new hard drive

Step 2.  Choose an unallocated space on your target SSD.

Select disk space

Step 3. Here you can adjust the partition on the destination disk. Then, keep the Note in mind.

Resize partition

Step 4. Click "Apply" and "Proceed" to commit the operation.

Apply

No 2. Clone disk Wizard

As we mentioned above, this feature will erase all data on the target disk, if you have a new disk or a disk without any important files, you can continue. Otherwise, we suggest you make a backup before we start.

Step 1. Click "All Tools" ->“Disk Clone Wizard” in the left pane.

Disk copy wizard

Step2. In the pop-up window, choose “Clone Disk Quickly” or “Sector by sector Clone”.

Clone disk quickly

Step 3. Choose the HDD as the source disk (here is Disk 1).

Select source disk

Step 4. Choose your SSD as the destination disk (here is Disk3), and tick the box before “Optimize the performance of SSD” to clone HDD to SSD alignment.

Select destinaltion disk

Step 5. you can adjust the partition size on SSD here.

Edit size

• Tip: If the target disk is smaller, the first option will be greyed out.

Step 6. You'll receive a note, after you read it, click “Finish” back to the main interface.

Finish

Step 7. you can preview the result, and do remember to “Apply” the operation.

Apply

Then you can reboot from the destination disk: please press a specific key to enter BIOS, elect the cloned SSD/HDD as the prior boot drive, and press "Enter" to boot from it.

Change boot order

• Note: If this clone is from an MBR to a GPT disk, please choose AOMEI Partition Assistant Professional.

Final lines

These two methods can help you safely, quickly, and easily copy OS to a new hard drive. AOMEI Partition Assistant is a powerful disk/partition manager for Windows users, many other helpful features in this utility can solve practical issues. You can also clone your OS to an external hard drive, or create a Windows to Go USB to enjoy your Windows wherever you are.