Cloning an old drive onto a new SSD is meant to be the easy way to upgrade a computer, and since Windows 10 reached end of support in October 2025 a lot of people have been doing it. Most clones go fine. But when one goes wrong, it can go very wrong: the tool copies the blank new drive over the old one, stops halfway with read errors, or leaves you with an SSD that will not boot and an old drive you are no longer sure about. Here is what each of those situations means for your data and what to do right now.
Stop first
If a clone is running in the wrong direction, cancel it immediately or power off the computer. Every second it runs, more of the original drive is overwritten. After that, do not start another clone, do not let Windows “repair” either drive, and do not format anything until you understand where your data still is.
Scenario 1: You cloned in the wrong direction
Tools such as Macrium Reflect, Clonezilla, Acronis and Samsung Data Migration ask you to pick a source and a destination. Pick them the wrong way round and the tool copies the new, empty drive over your original one. It usually works from the beginning of the drive forward.
What that means:
- The start of the original drive is overwritten first. That is where the partition table and the main file system structures live, so the drive will look empty or unformatted even if only a small amount was overwritten.
- Data in the overwritten area is gone. No lab can recover data that has been physically overwritten, and you should be wary of anyone who claims otherwise.
- Data beyond the point where the clone was stopped is often still there. On a hard drive, files in that area can frequently be recovered by rebuilding the file system or reading the raw data, though file names and folders may be partly lost.
- On an SSD, chances are lower. Some tools tell the destination SSD that unused space can be discarded (TRIM), and the SSD may then erase those blocks itself.
The amount that survives depends mostly on how long the clone ran. A clone cancelled after a minute is very different from one that ran to the end.
Scenario 2: The clone failed part way with read errors
If the clone stopped with a message about read errors, bad sectors or “unable to read from disk”, the problem is usually the old drive, not the software. It is failing, and the clone has just spent a long time hammering its weakest areas.
- Do not keep retrying the clone, and do not run CHKDSK or a “bad sector repair” on the old drive.
- Do not use the “ignore bad sectors” option repeatedly on a drive that is getting worse. Each pass puts more wear on weak heads or failing flash.
- If the old drive is clicking, slowing down or disappearing, power it off. A proper lab image reads the good areas first and comes back to the difficult ones carefully.
Scenario 3: The clone finished, but the new SSD will not boot
This is the least serious case, because your original drive should be untouched. Common causes are a boot mode mismatch (UEFI versus legacy BIOS, or GPT versus MBR), a missing EFI system partition, the computer still trying to boot from the old drive, or BitLocker asking for its recovery key on the new hardware.
- Keep the original drive exactly as it is until the new one works and you have checked your files on it. Do not wipe, reuse or recycle it.
- If BitLocker asks for a recovery key, find it in the Microsoft account linked to the PC (or your organization’s IT) before you try anything else.
- If you put the original drive back and it no longer boots either, stop and work out why before going further.
What not to do in any of these cases
- Do not install data recovery software onto the drive you are trying to recover.
- Do not “initialize” a drive that Windows says is unknown or not initialized.
- Do not run a second clone over the top of the first, in either direction.
How a lab approaches it
We start by making a full copy of the affected drive and work only from that copy, so nothing more is lost. For a wrong-direction clone, we map how far the overwrite reached and rebuild what survives beyond it. For a failing source drive, we image it in a controlled way so the readable data comes off before the drive gets worse. An engineer evaluates the drive and gives you a fixed quote, and recovery starts only when you approve it. You can read more on our how it works page, and about hard drive and SSD data recovery.
Need help after a clone went wrong?
Power the drive off and leave it as it is. Call Data Retrieval at (213) 986-4855. We work on-site across Los Angeles, the Inland Empire and Ventura County, and accept mail-in drives from anywhere in the US.