4K Alignment: Align SSD after Clone in Windows 10/8/7

January 29, 2018

After cloning HDD to SSD or cloning OS to SSD, how to make your SSD alignment with 4K for better performance? This article introduces AOMEI Partition Assistant as an easy 4K alignment tool. It also provides detail steps in aligning SSD after clone.

After updating firmware from HDD to SSD and migrating OS, you may have headache when you see your computer work in a speed you are not expecting: SSD boots even much slower than single HDD boots! Don’t be mad or panic! We will help you walk through with a step-by-step tutorial. By aligning SSD partitions, we will get a speedy computer.

Why SSD boot slower after migrating OS from HDD to SSD?

The very reason behind slow SSD boot is wrong partition alignments:

Any direct OS migration is the process of copying everything from the old to the new. It completely ignores mechanical differences. But there lies diversity between HDD and SSD, so you only find out:

  • Installing Windows on SSD, no trouble.

  • Migrating OS from SSD to SSD, works fine.

  • However, when migrating OS from HDD to SSD, we see a tremendous speed drop in PC Startup!

It’s because of misaligned partition in SSD: SSD starts 1st partition after 64 empty blocks, while HDD begins 1st partition after 63 blocks. Therefore, it takes time for computer to go through block to block to find the right file to load in SSD.

Tip - Judging SSD partition is misaligned: Keystroke “Win” key + “R”, input “msinfo32”, go “Components”, ”Storage”, “Disks”, find SSD. Dividing the figure in “Partition Starting Offset” by 4096, if you get a fractional number, then SSD partition is misaligned. That’s the reason of slow SSD boot.

How to fix misaligned partition in SSD? - 4K Alignment

Choosing the right partition manager to re-align partition will save a lot of works. We introduce AOMEI Partition Assistant Standard as the tool to make 4K alignment easily.

Please go and download AOMEI Partition Assistant before making any movements:


Then, we need 4 steps to fix misaligned SSD partitions and speed up SSD performance.

Step 1: Launch and enter the main interface. Move mouse to select a SSD partition.

Step 2: Right-click SSD partition, choose “Advanced” and “Partition Alignment”.

Speed up SSD by align partition

Step 3: In the new floating windows, we need to choose partition sector to align. In SSD optimization, we strongly recommend you to use “8 Sector” (normally we know it as SSD 4K alignment). After that, “OK” and “Apply” to run the software. When finished, this SSD partition is right aligned.

Align SSD after clone with 4K alignment

Step 4: Repeat Step 2 to 3, apply on the rest SSD partitions. If you just have one SSD partition, ignore this step. After all done, fixing job is all finished.