By Andrew Armstrong 
Cloning a laptop drive is one of those jobs that’s genuinely simple, right up until the new drive won’t boot and you’re staring at a machine with no operating system. Almost all of that risk comes from three decisions made before you start.
This covers checking what actually fits, cloning properly, and what to do when the clone won’t boot.
Quick Facts
- Check the form factor first. M.2 2280 is common but not universal: 2242 and 2230 exist, and some laptops still use 2.5in SATA.
- You need a USB enclosure or adapter matching the new drive, so you can clone before swapping.
- The new drive must be at least as large as the used space, not the total size, of the old one.
- Disable BitLocker before cloning, or suspend it. Cloning an encrypted drive causes most of the failures.
- Keep the old drive untouched until the new one has booted and been used for a week.
Work out what fits
Three things to establish before ordering:
- Interface. NVMe and SATA M.2 drives look almost identical and are not interchangeable. Check the laptop’s specification or an existing drive.
- Length. M.2 drives are named by size: 2280 is 22mm × 80mm. A 2280 won’t fit a slot designed for 2242.
- Keying. The notch position differs between B-key and M-key. If it doesn’t slide in easily, stop. Don’t force it.
# What you currently have
Get-PhysicalDisk | Select-Object FriendlyName, MediaType, Size, BusType
# How much space is actually in use
Get-Volume C | Select-Object DriveLetter, FileSystemLabel, Size, SizeRemainingSome ultrabooks have soldered storage and no slot at all. Worth a two-minute check on the manufacturer’s service manual before spending anything.
Before you clone
Quick Steps
- Back up first. Cloning is usually safe, but this is the moment when both copies of your data are in play.
- Suspend or disable BitLocker:
manage-bde -protectors -disable C: -RebootCount 0 - Free up space so used space fits comfortably on the target. Empty the recycle bin and clear temp files.
- Run
chkdsk C: /scan. Cloning a filesystem with errors copies the errors. - Fit the new drive in the USB enclosure and confirm Windows sees it in Disk Management.
- Initialise it as GPT if prompted. Nearly all modern laptops boot UEFI, which requires GPT.
BitLocker is the single biggest cause of failed clones. An encrypted volume cloned block-by-block often produces a drive the firmware won’t boot, or one that demands a recovery key that doesn’t match. Suspend it, clone, then re-enable afterwards.
Cloning
Most SSD manufacturers bundle cloning software free with their drives. Samsung, Crucial and WD all do, and using the vendor’s own tool avoids compatibility surprises. Macrium Reflect is the usual alternative.
Whichever you use, the important settings are the same: clone all partitions, not just C:. A modern Windows drive has an EFI system partition, a Microsoft reserved partition, the Windows partition and often a recovery partition. Miss the EFI partition and the clone will not boot.
If the target is larger, tell the tool to expand the Windows partition to fill it. Otherwise you’ll end up with a 1TB drive containing a 256GB partition and a lot of unallocated space.
The swap, and when it doesn’t boot
Quick Steps
- Power down fully. Not sleep, not Fast Startup.
shutdown /s /t 0. - Disconnect power and remove the battery if it’s removable.
- Swap the drives, keeping the original somewhere safe.
- Boot into firmware setup and confirm the new drive is detected.
- Boot Windows and check everything works before doing anything else.
- Re-enable BitLocker:
manage-bde -protectors -enable C:
If it doesn’t boot, the cause is nearly always one of four things: the EFI partition wasn’t cloned, the firmware is set to Legacy/CSM rather than UEFI, the boot order is pointing elsewhere, or BitLocker was active during the clone. In every case the original drive still works, so put it back and try again rather than panicking.
Glossary
| Term | What it means |
| M.2 2280 | A drive 22mm wide and 80mm long. The most common laptop size, but not the only one. |
| NVMe vs SATA M.2 | Same slot shape, different protocols. Not interchangeable. Check before buying. |
| EFI system partition | A small partition holding boot files. A clone without it won’t boot. |
| GPT | The modern partition scheme required for UEFI booting. |
| Disk cloning | Copying every partition from one drive to another, producing a bootable duplicate. |
| Fast Startup | A hybrid shutdown that leaves the filesystem in a state that can confuse cloning. |
Frequently asked questions
Do I need to reinstall Windows after cloning?
No. That’s the point. A correct clone boots exactly as the original did, with your applications and settings intact. Windows may briefly reactivate itself, which is normal.
Will my Windows licence still work?
Yes. Modern licences are tied to the motherboard, not the drive. Changing storage doesn’t deactivate Windows.
What size SSD should I buy?
At least as large as your used space, but 1TB is the sensible minimum for a machine you’ll keep a few years. The price gap between 500GB and 1TB is usually small.
Can I clone without an enclosure?
Only if the laptop has two drive slots. Otherwise you need the new drive connected via USB while the old one is still installed. Hence the enclosure. It’s also useful afterwards for turning the old drive into portable storage.
What do I do with the old drive?
Keep it untouched for a couple of weeks as a fallback. After that, an enclosure turns it into a fast portable drive, but wipe it properly first if you’re passing it on.
Gear We Recommend
Doing a drive swap? Here’s the enclosures, drives and tools we’d have on the desk.
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