By AOMEI / Last Updated October 12, 2019

About the freeware

AOMEI Partition Assistant Standard is the freeware to help you clone HDD to SSD of different sizes successfully while keeping the best performance of the SSD by aligning partition:

SSD, with 4k size paralleled to 4k sectors, has a 4096 bytes or large internal memory page size. Sometimes the partitions created on SSD will be misaligned after users clone HDD to SSD, and the SSD has to read data across 4k sectors. In this situation, the time of the SSD to read or write will be increased, as a result, the system performance will be decreased.

Luckily, free AOMEI Partition Assistant Standard is able to align partition during cloning process so to keep the best performance of SSD, and operating system.

Besides, there are two copy methods which are insurances when you clone HDD to SSD of different sizes.

  • If you clone smaller HDD to larger SSD or SSD with the same size, you can do sector by sector clone which refers to clone all sectors of HDD no matter it is used or not so that you get a 100% identical copy and AOMEI guarantee the job success even there are blank sectors or logically bad sectors.

  • If you clone HDD to smaller SSD, you are allowed to clone only used space so to make a successful clone. Since there are both used and unused space on the drive, clone only used space will reduce the occupied space without cloning the unused space on drive.

Next, let’s see details of how to clone HDD to SSD different sizes with the freeware - AOMEI Partition Assistant Standard.

Clone HDD to SSD with AOMEI Partition Assistant step by step

AOMEI Partition Assistant Standard works well with all Windows editions including Windows 7/8/8.1/10/XP/Vista. Before you clone HDD to SSD, you should connect the SSD to your computer and free download AOMEI Partition Assistant Standard.

Download Freeware Win 10/8.1/8/7/XP
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Step 1. Install and launch AOMEI Partition Assistant Standard. Click "All Tools" ->“Disk Clone Wizard” in the left pane.

Disk Copy Wizard

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

Copy Disk Quickly

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

Select Source Disk

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

Select Destination Disk

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

Edit Disk


  • The first option “Clone without resizing partitions” is gray out, because the SSD is smaller than the HDD here.

  • Fit partitions to entire disk” will adjust partitions on SSD automatically.

  • Edit partitions on this disk” allows you to resize a single partition once a time by sliding leftward or rightward.

Step 6. It will give you a note, read it and click “Finish” back to the main interface.


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


Note: For cloning system disk, AOMEI Partition Assistant Standard supports MBR to MBR; if you need to clone MBR system disk or copy GPT disk to MBR/GPT, please upgrade to Professional version.

Wrap things up

As you can see, AOMEI Partition Assistant Standard can clone HDD to SSD of different sizes effortlessly. And it enjoys many useful functions, such as migrate OS from HDD to SSD, copy single data partition and resize partition, etc. Try it and it will not let you down.