Updated on November 9, 2026.
You can move an old SSD to a new computer without formatting it if the new PC has a compatible slot, cable, or USB enclosure. To keep your files, the simplest route is to start the new PC from its own drive and connect the old SSD as extra storage.
Trying to start Windows from the old SSD is a separate job. Make a backup and save any BitLocker recovery key before taking the old PC apart.
Check which type of SSD you have
Look up the model number printed on the SSD and check the new PC’s manual. With an M.2 drive, check both the supported length, such as 2280, and the interface. Two drives can look alike and use different interfaces.
| Old SSD type | Connect it inside the PC | Connect it over USB |
|---|---|---|
| 2.5-inch SATA | Use a supported drive bay and SATA connector. A desktop normally needs a SATA data cable and a power connector. | Use a 2.5-inch SATA enclosure or SATA-to-USB adapter. |
| M.2 SATA | Use an M.2 slot that supports SATA and fits the drive’s length. | Use an enclosure that lists M.2 SATA support. |
| M.2 NVMe | Use an M.2 slot that supports PCIe/NVMe and fits the drive’s length. | Use an enclosure that lists M.2 NVMe support. |
Some slots and enclosures support both M.2 interfaces. Check the product specifications before buying an adapter. Kingston’s SATA and M.2 compatibility guide
Back up, connect, and copy your files
- Make a separate backup. If the old PC starts, copy important folders to another drive or a backup service and open a few files to verify the copy. If BitLocker or Device Encryption is on, save the drive’s recovery key somewhere you can access from the new PC. Microsoft’s recovery key backup instructions
- Connect the SSD. For an internal install, shut down and unplug the computer and follow its service manual. For a file transfer over USB, fit the SSD into the correct enclosure, then plug it into the new PC.
- Start Windows from the new PC’s own drive. Open File Explorer > This PC and find the old SSD. Windows may give it a new drive letter. If prompted, unlock the volume with its password or matching recovery key.
- Copy the files to the new PC. On an old Windows drive, look under Users > your old account name for Desktop, Documents, Pictures, and Downloads. Open files from their new location before erasing or reusing the old drive. Reinstall apps on the new PC and use their export or sync features for settings where available.
What to do if Windows cannot see the old SSD
Right-click Start and open Disk Management. Check the disk size and partitions to identify the old SSD. If the expected data volume is healthy, uses a file system Windows can read, and simply has no letter, assign it an unused drive letter. Leave EFI and recovery partitions alone. Microsoft’s drive letter instructions
If Windows asks to initialize or format a drive that has your files, cancel the prompt. Check the cable or enclosure type and try the SSD in its original PC if possible. If a known data volume shows as RAW or Unallocated, avoid writing to it while you investigate. Microsoft’s Disk Management troubleshooting guide
Can you use the old SSD as the Windows boot drive?
It may boot, but the new PC can have different storage drivers, firmware settings, or activation requirements. A hardware change can also trigger BitLocker recovery. Keep a backup and the matching recovery key ready. If the new PC already has Windows, using that installation and copying your files is the simpler option. Microsoft’s Windows activation guide
Cloning is an option if you want to copy the entire old disk to a different SSD. A clone can overwrite the destination, so identify both drives and back up anything already on the destination before starting. For encrypted drives, see our guide to checking and managing BitLocker in Windows.
Frequently asked questions
Do I need to format an old SSD before using it in another PC?
No. A readable, compatible drive can keep its existing files. Cancel a format prompt if it contains data you still need.
Can I move an SSD from an Intel PC to an AMD PC?
Yes, for file access, as long as the new system supports the drive’s interface and can read or unlock its file system. Booting the old Windows installation has separate requirements.
Can I copy files from a laptop SSD with a USB adapter?
Yes. Match the adapter to 2.5-inch SATA, M.2 SATA, or M.2 NVMe. For M.2, check that the enclosure also fits the drive’s length.
What if the old SSD asks for a BitLocker recovery key?
Match the recovery key ID to the key you saved, or check the Microsoft account or organization that managed the old device. Keep the drive intact while you look for it. Microsoft’s guide to finding the recovery key
Will moving my SSD bring over my apps and Windows license?
Using it as a second drive lets you copy files. Reinstall programs on the new PC. If you try booting the old Windows installation, activation depends on the license and the new hardware.