By Michael / Last Updated June 16, 2021

SSD running slow in Windows 7/8/10

After updating firmware from HDD to SSD and migrating OS to SSD in Windows 7/8/10, you may have headache when you see your computer works in a speed you are not expecting: SSD boots even much slower than single HDD boots! Don’t be mad or panic!

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

The very reason behind slow SSD boot is wrong partition alignment. By aligning SSD partitions, we will get a speedy computer.

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 is 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.

✍ Tips: Check if 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 for slow SSD boot.

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

SSD adopts the smallest 4k sector to save data. If the 4k allocation units are not aligned in SSD, reading writing data can need to across multiple sectors, causing SSD's poor performance. Thus, here introduce AOMEI Partition Assistant Professional, a tool that can make SSD 4k alignment easily and effectively. It works well with Windows 7/8/10; if you are running Windows Server, to employ its Server edition.

Please install AOMEI Partition Assistant Professional before making any movements.

✍ Note: It is available to download its demo version to have a try.

Download Freeware Win 10/8.1/8/7/XP
Secure Download

Then, we need 5 steps to fix misaligned SSD partitions and speed up SSD performance.

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

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

Partition Alignment

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).

8 Sector

Step 4. After that, “OK” and “Apply” to run the software. When finished, this SSD partition is right aligned.

Apply Alignment

Step 5. Repeat Step 2 to Step 4, apply on the rest SSD partitions. If you just have one SSD partition, ignore this step. After all done, the fixing job is all finished.

Wrap things up

Now, surely you have known how to align SSD after clone. Actually, there are many other useful features built-in AOMEI Partition Assistant Professional. For example, it enables you to make SSD Secure Erase; it allows you to convert SSD to GPT without data loss; and more.