By Emily / Last Updated January 8, 2020

Why do you clone C drive to external hard drive?

There are many reasons why you might need to clone c drive to external hard drive. Normally, 3 aspects are responsible for this action.

▶When your computer, with the Windows system preinstalled in the c drive, fails to work and you have to buy a new one, you may want to clone C drive to SSD or HDD as a portable Windows before getting the new computer.

▶You might be planning to make your just-bought and brand new SSD as a boot disk and the old HHD as a data storage disk to enjoy a much better performance, but don’t want to spend much time reinstalling the OS and all your necessary applications. Cloning the system drive to external hard drive could be a great idea.

▶When the performance of most computers tend to become terrible after a long time of usage due to numerous caches, applications, data and etc, you may decide to clone system drive to an external hard drive, like SSD, and boot it from SSD to improve the performance. That’s because SSD doesn’t contain any moving parts, which means a lot when it comes to raising the booting up and data accessing time.

In those cases, cloning seems to be the best solution. But is there any way or tools that could make this process much easier? The answer is yes. Keep reading to get more about this.

Best cloning software-AOMEI Backupper

To make this job as easy as possible, a powerful and reliable software has been developed-AOMEI Backupper Pro. It is able to clone the whole c drive with Windows7/8/8.1/10 from an internal hard disk to an external hard drive. What’s more, the cloned OS could boot directly from external hard drives on any computer. Now let’s see how it works.

1) Install and launch the software.

2) Select "System Clone" under "Clone" tab. The program will automatically select C: drive.

Choose System Clone

3) Choose a target partition to clone C: drive.

Choose Destination Partition


▶The selected destination partition should not be smaller than the c drive in storage space. Please clone the system partition to the first partition or the first available area on the target disk so that the system could boot from the target disk.

▶MBR disks support both Windows&Server 32-bit and 64-bit system, while the GPT disk only support the 64-bit version, and it could only be used as a data drive on 32-bit system. So if you plan to convert disk from MBR to GPT, upgrade it to 64-bit firstly. If you need to clone system drive (32-bit versions installed) from MBR to GPT, please make sure the motherboard supports the EFI/UEFI before cloning to ensure it could boot successfully later.

4) Click "Yes" if you have already made a backup.

Partitioned Hdd Warning

5) Click "Start Clone" to finish this operation. If the external hard drive is an SSD, you can tick “Align partition to optimize for SSD” to optimize the performance.

System Clone Preview Align Checked

Additional information about AOMEI Backupper

Apart from cloning c drive to external hard drive, AOMEI Backupper is also working well when you need to clone a hard drive or SSD. With it, you can back up system and create a system image to keep Windows and applications safe. Or you may need to set an automatic backup to avoid forgetting backing up in future and data loss.

Notes: If you use the Windows Server operating systems, you need to upgrade the Standard edition to Server one. But you can experience many more amazing functions that Standard doesn’t offer, so it’s definitely worthy of your hard-earned money.