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SSD vs HDD, and how to move Windows to an SSD (cloning)

Updated October 30, 2026

If your PC runs Windows from a spinning hard drive (HDD), replacing it with a solid-state drive (SSD) is usually the single biggest speed improvement you can buy. Start-up, opening apps and searching files all get dramatically quicker.

SSD vs HDD in plain terms

HDD: spinning platters and a moving arm. Cheap per gigabyte and fine for storing photos, videos and backups, but slow to find small files — which is exactly what Windows does all day.
SATA SSD: flash memory with no moving parts, in a 2.5-inch case that connects with the same cables as a laptop hard drive. A huge step up from an HDD.
NVMe SSD: a small M.2 stick that plugs into the motherboard. Faster still for big file transfers; for everyday use it feels similar to SATA. See how to choose an NVMe SSD.

SSDs are also quieter, use less power and survive bumps better — useful in laptops.

Is Windows on a hard drive?

Open Task Manager › Performance. Each disk is labeled SSD or HDD; the one that shows C: is your Windows drive. Or run our free scan, which flags this automatically.

Option A: clone (copy everything as-is)

Cloning copies Windows, your apps, settings and files to the new drive so the PC starts up exactly as before, just faster.

What you need

An SSD at least as large as the used space on your current drive (bigger is better).
For a laptop with one drive bay: a USB-to-SATA adapter or USB NVMe enclosure to connect the new drive temporarily.
Cloning software. Many SSD makers offer free tools for their own drives — for example Samsung Magician (Data Migration), Crucial's and WD's Acronis-based tools. Free third-party tools such as Macrium Reflect's free edition have been discontinued, so check what your drive's maker provides first.
A backup of anything important. Cloning is reliable, but mistakes in choosing the target drive erase data.

Steps

Free up space and empty the Recycle Bin first so there's less to copy (see freeing up space on C:).
Connect or install the new SSD. In Disk Management (right-click Start), if Windows asks to initialize it, choose GPT. Don't create a volume.
Open the cloning tool, choose the old drive as source and the new SSD as destination. Double-check by size and model name.
Let it copy every partition, including the small hidden ones (EFI, recovery). Let the tool expand the main partition to fill the new drive.
Shut down. Either swap the drives physically, or leave both and choose the SSD as the first boot device in the BIOS/UEFI.
Start the PC and confirm C: is now on the SSD (Task Manager › Performance).
After a few days of normal use, you can format the old HDD in Disk Management and use it for storage.

Option B: clean install (a fresh start)

A clean install removes years of clutter and is often even faster. You'll reinstall your apps and copy files back, so it takes longer to set up.

Back up your files to an external drive or cloud. Make a list of apps you need and have the sign-ins ready.
On another PC or before the swap, create a USB installer with Microsoft's Media Creation Tool (from Microsoft's “Download Windows 11” page; a USB stick of 8 GB or more is needed).
Install the SSD and, if you can, disconnect the old drive so nothing is overwritten by mistake.
Boot from the USB stick (often via F12, F11 or Esc at power-on) and follow the setup. Windows activates automatically on a PC that was activated before.
Reconnect the old drive afterwards to copy files back.

Common problems

PC still starts from the old drive: change the boot order in BIOS/UEFI or remove the old drive.
“Not enough space” when cloning: the used space is larger than the SSD. Move videos and games off first.
New drive doesn't appear: check that the M.2 slot supports that drive type, and that it's initialized in Disk Management.
Laptop with BitLocker / Device Encryption: make sure you have your recovery key (at aka.ms/myrecoverykey for Microsoft accounts) before you start.

Keep the old HDD?

In a desktop, yes — it's useful for backups, media and games that don't need speed. In a laptop, an old hard drive in a cheap USB enclosure makes a handy backup drive.