How to Move Windows to a Different Drive

Moving Windows to a new drive means copying the entire operating system and all its system files to fresh storage, then booting from that drive instead of the old one

You cannot straightforward drag the Windows folder to a new drive the way you would move documents. Windows is deeply woven into your computer's startup process, boot files, and system partitions. Moving it requires either cloning (copying the entire drive bit-for-bit) or a fresh Windows installation on the new drive, then transferring your files and programs afterward.

The method you choose depends on whether you want to keep your current setup exactly as it is, or whether you are willing to reinstall Windows and your programs from scratch. Cloning is faster if everything works now. A fresh install takes longer but often runs cleaner on new hardware.

Key Takeaways

Cloning copies your entire drive to a new one and preserves all programs, settings, and files, but requires cloning software and a way to connect both drives to your computer at once.
A fresh Windows installation means downloading Windows from Microsoft, installing it on the new drive, then manually moving your files and reinstalling your programs.
After either method, you must change your computer's boot order in BIOS or UEFI so it starts from the new drive instead of the old one.
If you are moving to a much larger or much smaller drive, or switching from an older drive type to a newer one, a fresh install often works better than cloning.
You will need either a second external drive, a USB adapter, or a second computer to connect both drives during cloning.

Cloning: Copy Everything to the New Drive

Cloning reads every byte on your old drive and writes it to the new one, creating an exact copy. When you boot from the new drive, everything looks and works the same as before — all your programs, settings, files, and Windows itself are already there.

To clone, you need cloning software. Windows does not include a built-in cloning tool. Common options are Macrium Reflect (free version available), EaseUS Todo Backup, Acronis True Image, or the cloning software that sometimes comes with external drives or SSDs. read the software on your current computer, then connect the new drive to your computer using a USB adapter or external enclosure so both drives are visible at once.

Open the cloning software, select your current drive as the source, select the new drive as the destination, and start the clone. The time this takes depends on how much data is on your old drive — a 500 GB drive might take 30 minutes to an hour. Do not turn off your computer during cloning.

After cloning finishes, shut down your computer, remove the old drive (or leave it disconnected), and restart. If the computer boots normally into Windows, the clone worked. If it does not, you may need to change the boot order in BIOS or UEFI, which is covered in the section below.

Fresh Installation: Start Over on the New Drive

A fresh installation means downloading Windows from Microsoft, installing it on the new drive as if it were a brand-new computer, then moving your personal files and reinstalling your programs. This takes longer than cloning but often results in a faster, cleaner system because you are not carrying over old temporary files, outdated drivers, or leftover program fragments.

First, read the Windows installation media from Microsoft's website using the Windows Media Creation Tool. This creates a bootable USB drive that contains Windows. You will need a USB drive with at least 8 GB of space.

Connect the new drive to your computer using a USB adapter or external enclosure, then plug in the Windows installation USB. Restart your computer and boot from the USB drive (you may need to press a key like F12 or Delete during startup to choose the boot device). Follow the Windows installation wizard, select the new drive as the destination, and let Windows install. This usually takes 20 to 30 minutes.

After installation, Windows will boot from the new drive. You will need to reinstall your programs from their original installers or from the Microsoft Store. Your personal files (documents, photos, downloads) can be moved from the old drive by connecting it as an external drive and copying the folders you need.

Changing Your Boot Order in BIOS or UEFI

Your computer has a startup menu called BIOS (on older computers) or UEFI (on newer ones) that tells it which drive to boot from. If you cloned your drive or installed Windows on a new one, you may need to change this setting so your computer starts from the new drive instead of the old one.

Restart your computer and watch the screen during startup. You will usually see a message like "Press F2 to enter Setup" or "Press Delete to enter BIOS" — the key varies by manufacturer. Press that key before Windows loads.

Inside BIOS or UEFI, look for a menu called "Boot Order", "Boot Sequence", or "Boot Priority". You should see a list of drives. Move the new drive to the top of the list so it is checked first. Save your changes and exit. Your computer will restart and should now boot from the new drive.

If you do not see the new drive listed, it may not be connected properly, or BIOS may not recognize it yet. Shut down, check that the drive is firmly connected, and try again.

Cloning vs. Fresh Install: Which One to Choose

Choose cloning if your current Windows installation runs well, you have many programs installed that would be tedious to reinstall, and you want to move to a similar drive (same size or larger, same type like SSD to SSD). Cloning is also the faster option overall.

Choose a fresh install if your current system feels slow or cluttered, you are moving to a much smaller drive, you are switching from a hard drive to an SSD for the first time, or you want a clean slate. A fresh install also avoids carrying over any malware or corrupted files from the old drive.

If you are moving from a large old hard drive to a small new SSD, cloning will not work because the clone cannot fit. In this case, a fresh install is your only option.

What to Do With Your Old Drive After Moving

After you have confirmed that Windows boots and runs normally from the new drive, you can repurpose the old drive. You can keep it as external backup storage by putting it in a USB enclosure. You can wipe it completely and sell it or recycle it. Or you can leave it in your computer as a secondary drive for extra storage, though you should disconnect it from the boot order in BIOS so your computer does not try to start from it by accident.

If you are selling or recycling the old drive, use a tool like DBAN (Darik's Boot and Nuke) or the manufacturer's find erase tool to wipe it completely. straightforward deleting files or formatting the drive does not prevent someone from recovering your data with specialized tools.

Troubleshooting: When the New Drive Does Not Boot

If you cloned or installed Windows but the computer does not start from the new drive, first check that the drive is properly connected and powered on. Then restart and enter BIOS or UEFI to confirm the new drive appears in the boot order and is set as the first option.

If the drive appears in BIOS but Windows still will not start, the clone or installation may have failed. Try the cloning or installation process again, or try a fresh Windows installation instead. If you cloned and it did not work, a fresh install often succeeds where cloning failed.

If you see an error message like "BOOTMGR is missing" or "No bootable device found", the boot files on the new drive may be corrupted. Restart from the Windows installation USB and use the repair tools built into the installer to fix the boot files.

Frequently Asked Questions

Do I need a product key to move Windows to a new drive?

If you clone your drive, Windows usually recognizes the new drive as the same computer and does not ask for a new key. If you do a fresh install, Windows will ask for a product key during setup. If your Windows came with your computer, the key is usually tied to your hardware and will reactivate automatically online.

Can I keep both drives in my computer and choose which one to boot from?

Yes. After you confirm the new drive works, you can leave the old drive connected as a secondary drive for storage. In BIOS, set the new drive as the first boot option so your computer starts from it by default. You can still access files on the old drive from within Windows.

How long does cloning take?

Cloning speed depends on how much data is on your drive and how fast your connection is. A 500 GB drive over USB 3.0 typically takes 30 minutes to an hour. A 1 TB drive might take 1 to 2 hours. Larger drives or slower connections take longer.

What if my new drive is smaller than my old one?

Cloning will not work if the new drive is smaller than the amount of data on the old drive. You must do a fresh Windows installation instead, then manually move only the files that fit on the new drive.

Will moving Windows to a new drive make it faster?

Moving to a new SSD from an old hard drive will make Windows noticeably faster. Moving from one SSD to another identical SSD will not. A fresh install on any new drive often feels faster because it removes old temporary files and unused program fragments, even if the hardware is the same speed.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.