How to Migrate Hard Drive to SSD without Reinstalling Operating System?

July 26, 2019

Want to upgrade hard drive to a solid-state drive (SSD)? Here will show you how to migrate hard drive to SSD on Windows 7/8/10 and boot from the SSD successfully.

Why you need to migrate hard drive to SSD?

More and more users would like to upgrade their hard drive to SSD for improving the performance of computer. As for a computer user, you may not like to change your OS and abandon your old data. Thus, migrate hard drive to SSD is necessary that you can keep your old data on the hard drive to the SSD. And here is how to migrate hard drive to SSD for upgrading without reinstalling Windows operating system.

How to migrate hard drive to SSD without reinstalling OS?

Change old hard drive to a big SSD could be an exciting thing for computer users. Cause SSD has better properties than traditional HDD, and this could improve the computer’s running speed a lot. But how to upgrade hard drive to SSD without losing any data? The migration would pull this work off easily.

Here you should prepare for the migration:

  • Move large folders that don't need to be kept on the SSD. Move large folders on the hard drive to another place will save a lot of space on the hard drive. Thus, you will take less time when copy hard drive to SSD. And it is useful if you are planning to transfer hard drive to SSD that is smaller than the hard drive.

  • Uninstall the programs that you aren't using anymore and delete the unnecessary files that you do not want to transfer to the SSD.

  • Backup your current hard drive. Backup hard drive should be the best way to prevent other accidents that may cause data loss.

  • Choose the right SSD for your PC (desktop or laptop). Before you buy an SSD, you need to check your drive’s form factor. Make sure the drive will fit in your laptop or desktop. There are more famous SSD brands you can choose, like Samsung SSD, Seagate SSD, Toshiba SSD, etc. You can choose one that encounters your demands.

  • Choose a disk cloning software. Windows cannot copy hard drive to SSD directly. Thus, you need to find a disk cloning software that can help you migrate hard drive to SSD simply without reinstalling Windows OS. And AOMEI Partition Assistant is such a great cloning tool that can transfer data from hard drive to SSD easily and safely. What’s more, you can use it to partition hard drive in a few simple steps.

Detailed steps of how to migrate hard drive to SSD:

After the preparation, you can start to migrate hard dive to SSD.

1. Connect SSD to your PC. If you are upgrading laptop hard drive to SSD, you’d better install the SSD to your laptop and connect the old hard drive with a USB cable in case of the SSD cannot boot successfully after cloning. Make sure the SSD can be detected by your computer. If not, you need to initialize disk with Diskpart or AOMEI Partition Assistant.

2. Install and launch AOMEI Partition Assistant. You will see the basic environment of your hard drives. To migrate hard drive to SSD, here you need right click the old hard drive on your computer, select Copy Disk at the drop-down menu. Or, you can click Disk Copy Wizard to do it.

Clone Disk

3. Here you can select an appropriate method to copy disk. The “Copy Disk Quickly” is highly recommended because with this method, you can copy hard drive to a smaller SSD as only it is enough to store data on the old hard drive, and you can edit partition size on the SSD flexible. While the “Sector-by-Sector Copy” will copy every byte on the hard drive no matter it used or not, thus, you can not edit partition size with this method.

Disk Copy Method

4. Then, it will pop out a window that you can choose the SSD as the destination disk to clone data to. Choose the Disk 2 as the target disk. Considering the target disk is an SSD, here we highly recommend you check the option of “Optimize the performance of SSD”, which will make SSD 4K alignment to perform at the best status.

Select Destination Disk

5. Next, you will be moved to the page that you could adjust the partition size on the destination disk. Here you can edit the partition size flexible as you like. You can also repartition hard drive after migrating hard drive to SSD.

Edit Partitions

6. Then, it will give you a note for how to boot operating system from the destination disk after clone or migration. Read it, click Finish.


7. You will back to the main interface, and you can see the pending operations. Click Apply to submit the whole progress. And click Proceed, it will execute under the PreOS mode.

Click Apply

How to boot from the SSD after migrating?

After the migration, you can boot from the SSD perfectly. However, sometimes, you cannot boot successfully in a few cases. If you cannot boot from the SSD, you can try to disconnect the source disk from the computer, or exchange the connection socket of destination disk and source disk, then, boot the computer from the destination disk.

There may be another situation that your computer cannot boot from the destination disk after migration. If you migrate from MBR disk to GPT disk, you need to make sure that your computer supports EFI/UEFI, otherwise, you cannot boot from the GPT disk. Fortunately, AOMEI Partition Assistant allows you to convert system disk between MBR disk and GPT Disk.


With the help of AOMEI Partition Assistant, migrate hard drive to SSD without reinstallation becomes much simple. What’s worth, the AOMEI Partition Assistant is more than a disk migration software. It can do a lot of things for hard drive partition. For example, you can only migrate OS to SSD with AOMEI Partition Assistant if you do not have a large SSD; if you still want to use the old hard drive to store data, it allows you to reformat the hard drive in a few steps; if you are Windows Server users, it provides youAOMEI Partition Assistant Server edition.