By Delia / Last update October 28, 2022

Overview for M.2 SSD

M.2 is a form factor for SSDs that resembles a stick of gum. They are much smaller than traditional 2.5-inch SSDs or hard drives - users can add an M.2 SSD to a laptop that does not have room for a regular one.

But are M.2 SSDs always faster? This is not a real question, because M.2 drives can utilize either the standard SATA interface or the PCIe interface. To be specific, there are both SATA and NVMe based SSDs with different storage technologies for you to choose. If you're looking for faster speed with a generous budget, just pick an M.2 NVMe SSD to enjoy the improved performance.


In any case, replacing old hard drive with an M.2 SSD is in line with the trend of technological development, and the upgrading from HDD to SSD itself can already boost to your computer's boot and read/write speed significantly. The best part is, you can directly clone HDD to M.2 SSD to keep the old data and OS intact without boot errors.

Important preparations before cloning HDD to M.2 SSD

If you are going to replace HDD with M.2 SSD, you need to figure out a few things before purchasing or replacing the M.2 SSD:

#1. Make sure your computer is compatible with M.2 SSDs.

Only the latest generation of motherboards will accept this new SSD, so please locate the M.2 interface on your motherboard first - it should be a horizontal slot about an inch wide labeled "PCIe" or "SATA" or both. You will need to purchase a matching M.2 SSD, because PCIe devices won't work with SATA connection and vice versa.

960 Pro M.2 SSD

#2. Make sure the motherboard supports booting from M.2 SSD. 

Note that booting from an NVMe PCIe SSD is only supported on systems that support UEFI. If your target drive is an M.2 NVMe SSD, then it will only boot in UEFI mode.

#3. Make sure the M.2 SSD has the right partition style.

A disk can be divided into multiple blocks called partitions. Each partition must have a partition style (GPT or MBR) to help Windows understand how to access the data on the disk. And the partition style must be compatible with the boot mode (MBR/Legacy BIOS and GPT/UEFI) to ensure Windows can boot properly.

In other words, if you purchased an M.2 NVMe SSD, it should be partitioned to GPT to support UEFI boot; if it's M.2 Sata SSD, there should be no strict requirements about partition style and boot mode. But GPT is still recommended because it is more suitable for modern computers and operating systems (e.g. Windows 11).

To check the partition style, press Win + R to open Run window -> type "diskmgmt.msc" and hit OK to open disk management -> right-click the disk and select "Properties" -> "Volume" -> check the "Partition style".

*You can change partition style after deleting all volumes from the disk, here's an example to convert MBR to GPT.

Disk Partition Style

#4. Make sure the M.2 SSD can be detected by Windows.

If you add a brand new disk to your PC and it does not appear in File Explorer, you may need to initialize it first.

Launch Disk Management with the above mentioned steps -> right-click the disk you want to initialize and click "Initialize Disk" (If the disk is listed as "Offline", first right-click it and select "Online") -> select the correct partition style in the Initialize Disk dialog box, and then click OK to confirm it.

Initialize Disk MBR or GPT

#5. Pick an effective tool to help you clone HDD to M.2 SSD.

Windows does not come with cloning functionality so you may need the help of 3rd party M.2 cloner.

When making your selection, you will also need to consider the above factors, such as whether the tool supports MBR/GPT disks, whether it supports cloning between disks of different sizes, whether it can take full advantage of SSD performance, etc.

Best HDD to M.2 SSD cloning software to suit different cases

In order to copy hard drive to M.2 solid state drive, the cloning software you use must be reliable and powerful. Here I recommend AOMEI Backupper Professional because it has the following capabilities:

Clone disks of different sizes: An M.2 SSD likely has different capacity with the old HDD, AOMEI's intelligent-sector cloning enables you to clone larger HDD to smaller SSD without problems. In addition, it allows you to edit partition size, which helps to make the full use of the disk space when the target drive is larger.

Support MBR/GPT disks: With it, you can clone MBR to MBR, GPT to GPT (eg: clone NVMe to NVMe), or MBR to GPT/GPT to MBR without conversion. If you want to make the partition style of the target disk the same as the source disk, there's also an option to convert it manually.

Flexible cloning options: Besides entire Disk Clone, there are System Clone for only OS migration, and Partition Clone for selected partitions cloning. Optionally, you can perform sector-by-sector clone, or align partitions to optimize the use of the target SSD.

Fully compatible: It works with Windows 11, 10, 8.1/8, 7, Vista, XP (all editions) perfectly. If you are running Windows Server, you can turn to the specialized Server edition.

Download the free trial of this cloning software to demonstrate its powerful cloning features:

Download Free Trial Win 11/10/8.1/8/7/XP
Secure Download

How to clone HDD/SSD to M.2 SSD (step by step)

After connecting your M.2 SSD to your computer, make sure it is recognized by your computer. Then you can follow the steps below to clone hard drive to M.2 SSD - the steps to copy SSD to M.2 SSD are the same.

Note that this software clones only used sectors to target disk by default, which enables you to clone HDD to SSD, even a smaller one. So you just need to make sure the target disk has enough space to hold all the data existing on the source disk.

Steps to clone hard drive to M.2 SSD:

1. Launch the software, click “Clone” and select “Disk Clone”. If you want to clone only OS, select “System Clone”.

Disk Clone

2. Select the original hard drive as source disk and select the M.2 SSD as the destination disk successively.

Select Disk

3. Tick "SSD Alignment" to accelerate the reading and writting speed of the destination SSD. Click “Start Clone” to start cloning HDD to M.2 SSD.

Start Clone

Optional options:

Sector By Sector Clone: By default, AOMEI Backupper will copy only used sectors to save space. If you want to copy all the sectors indiscriminately, please check this option. Note if you want to clone a disk with system reserved recovery partition, you need this option to ensure the recovery partition can work on the target SSD.

Edit Partitions: To make the full use of the space of the M.2 SSD (especially when you clone smaller disk to a larger one), you can edit partitions by the following options (Edit Partitions cannot work with Sector By Sector Clone).

  •  Copy without resizing partitions: It will not resize the partition size.
  • Add unused space to all partitions: Reallocate the unallocated space to each partition of the target disk.
  • Manually adjust partition size: Extend unallocated space to any partition on the destination disk you want. 
  • Convert the destination disk...: Convert the partition style of the target disk to make it the same as the source.

Add Unused Space

How to boot from the cloned M.2 SSD

After successful cloning, you can shut down the computer to replace the hard drive with M.2 SSD. Then start the computer, if it boot into Windows properly, then your job is done. 

Note if your old HDD is partitioned with MBR, and your cloned drive an M.2 NVMe SSD partitioned with GPT, then you need to access BIOS by pressing the specific key (could be Del, F2, F8, F12, etc.) during startup, and change the boot mode from Legacy BIOS to UEFI.

uefi boot mode

You can also connect the old hard drive for the secondary storage, but to avoid Windows booting from the wrong disk, you need to make sure the M.2 SSD is selected as the first boot option in BIOS.

Final Words

After reading this article, you may know how to clone HDD to M.2 SSD. It is strongly recommended to replace the old hard drive with an SSD for better performance. With the help of AOMEI Backupper, you can easily clone all kinds or brands of hard drives or upgrade M.2 SSD without reinstalling Windows