By AOMEI / Last Updated May 30, 2019

The case

I've been running into clone problems lately with 1TB hard drives. HDClone gives me an error saying different block sizes aren't supported. Clonezilla won't work either and it's really a bother to do a clean install and migration manually. Karen's Replicator is another possibility that I've considered but it's a bit time-consuming, especially with hard drives that have multiple partitions.

Why copy drives with different block sizes?

When it comes to copying drives with different block sizes, you first need to know what the disk block size is. In computing, a sector is a subdivision of a track on a disk. A block is actually a group of sectors. As for the disk block size, it is the size of a block in file systems and data storage.

In our daily life, we often need to clone hard drive with different block sizes for various reasons. There are two main reasons as below.

  • Hard drive upgrade. Users usually clone their old hard drive to a larger hard drive for a big capacity because of insufficient disk space. Some people also clone the old hard disk drive to a solid state disk for a good performance.

  • Hard drive backup. To prevent data from being lost, some users choose to clone the hard drive to another hard drive just in case.

Copying drives with different block sizes – easy and efficient

Copying between drives with different block sizes is not supported? Don’t worry! Your problem will be solved soon with the help of AOMEI Backupper. This powerful software allows users to clone drives with different block sizes. You can run this freeware smoothly on Windows 10, Windows 8.1/8, Windows 7, Windows Vista and XP.

Apart from cloning disks with different sizes, other practical features like cloning partition/volume, restoring disk are also available in the best free software. You can even use it as block level replication software. With these features, your personal data can be protected well.

How to clone hard drive with different sizes? All you need to do are a few clicks. Here is a quick guide for your reference.

Detailed steps of copying drives with different block sizes

Step 1. Download, install and launch this software. Click Clone from the left side. Then click Disk Clone.

Click Disk Clone

Step 2. Select your Source Disk (Disk 0). Then click Next.

The Source Disk

Step 3. Select the Destination Disk (Disk 1) with different block size from the source disk. Then choose Next.

The Destination Disk

Step 4. If all things are right in this Operation Summary interface, you can click Start Clone.

Click Start Clone

  • There are three options under Edit partitions on the destination disk: Copy without resizing partitions, Add unused space to all partitions, Manually adjust partition size. The last option is supported by AOMEI Backupper Professional. If you want to edit every partition size of the destination disk, you can upgrade to the advanced version to enjoy this feature.

  • Sector by sector clone means the program will clone all sectors no matter it is used or not. Thus, you must make sure that the destination disk is equal to or larger than the source disk.

  • If your destination disk is an SSD, you can click Align partition to optimize for SSD to accelerate the reading and writing speed.

  • After cloning, the destination disk will be overwritten. If you have some important data on the destination disk, you must backup them in advance.

  • If you’ve cloned system hard drive to another drive, make sure to change boot order or replace the old hard drive to boot from the cloned drive.

This software also allows you to clone GPT disk to smaller SSD with the same steps above.


Simple steps and intuitive interface make your disk clone effortless. Copying drives with different block sizes can be performed easily by AOMEI Backupper. It is worth mentioning that the cloning process won’t interrupt your work. You can do your work without any concern.