By AOMEI / Last Updated June 12, 2020

My cloned hard drive shows wrong size, why?

When you upgrade to a larger hard disk drive (HDD) or solid-state drive (SSD) by cloning the old drive, you may find the cloned hard drive has the same disk space as the original drive. In other words, the cloned drive not showing full capacity.

This is because when you clone a hard drive, you also cloned the partition size besides the data. When the cloned drive is larger than the original drive, most of the cloning programs, if not all, will leave the extra space on the cloned hard drive as unallocated space. And then you will meet the issue that HDD/SSD shows wrong capacity.

In Windows File Explorer, you cannot see the unallocated space. That is why some users say they have lost disk space after cloning hard drive. You can open Disk Management to see if there is unallocated space on your cloned hard drive.

How to fix cloned hard drive shows wrong size?

There are two workaround solutions to fix the HDD/SSD shows wrong capacity. If you have finished cloning the hard drive, you can go to Disk Management to handle unallocated space after cloning. Or if you prefer a quick fix once for all, you can perform disk clone via professional cloning software that can help you clone to a larger drive without causing disk capacity loss.

Part 1. How to use full capacity of cloned hard drive

You can add the unallocated space on the cloned hard drive to the contiguous partition with Disk Management or DiskPart.exe. Follow the steps below to expand partitions after cloning in Windows 10/8/7 using Disk Management.

1. Press Windows + R key to open the Run window. Type “diskmgmt.msc” and press Enter to open Disk Management in Windows 10/8/7.

2. In Disk Management, right-click on the partition before the unallocated space, and select Extend Volume.

3. Follow the Extend Volume Wizard to add unallocated space to this partition.

✍ Tips:
● If the partition and the unallocated space are not contiguous, you may encounter the issue “Extend Volume greyed out”.
● Besides extending volume, you can also use the unallocated space to create one or more new partitions. Just right-click on the unallocated space and select New Simple Volume.

If you can neither use the unallocated space to extend the adjacent partition nor create a new partition, then your cloned hard drive is larger than 2TB and it is MBR partition style. On MBR disk, disk space beyond 2TB will become unusable.

In this case, you can't use full HDD capacity after cloning unless you convert it to GPT disk. Converting a disk to GPT from MBR with Disk Management requires you to delete all the partitions on this hard drive. Then the time you spent on cloning hard drive is for nothing.

Or if you want a way to prevent cloned hard drive with unallocated space in the first place? Keep reading to learn more.

Part 2. How to avoid cloned hard drive shows wrong size

The key to cloning hard drives of different sizes without leaving unallocated space is to choose proper cloning software. There is specialized hard disk cloning software called AOMEI Backupper Professional that can help you clone hard drive to a larger one without causing disk capacity loss.

  • For cloning to a much larger HDD or SSD, AOMEI Backupper gives you three options to manage the partition size. You can manually edit the partition size on the clone disk, let the program automatically adjust the partition size to fit up the entire hard drive, or clone without resizing partitions.

  • When cloning MBR disk to GPT disk larger than 2TB, you will not lose disk space beyond 2TB because the program takes care of it. The cloned hard drive can still be used as GPT disk and remains bootable.

  • When you upgrade to an SSD, it provides an option to align partitions to optimize for SSD. What’s more, it will not interrupt your work while cloning because of the volume shadow copy service (VSS) technology.

★ Step-by-step guide to clone to a larger SSD without unallocated space left

AOMEI Backupper provides an intuitive interface, which makes all operations in AOMEI Backupper quite easy. To upgrade to a larger SSD, you can follow the steps below.

1. Connect the target SSD to your computer and make sure it is detected. Install this program on your computer, and open it.

✎ Note: If there are important data on the target SSD, do backup files before cloning, or you will lose them.

2. Select “Disk Clone” under "Clone" tab.

Disk Clone

3. Click on the current drive to select it as the source disk, and click on "Next". Then click on the larger SSD to set it as the destination disk, and click “Next”.

Select Disk

4. In the Operation Summary page, click on “Edit partitions” and then choose from the two options below to deal with unallocated space on the cloned drive:

- Add unused space to all partitions: the program will automatically extend all existing partitions with unallocated space.

Add Unused Space

- Manually adjust partition size: you can click on each partition and drag the side bar to edit the partition size.

Manually Adjust Partition Size

5. Check the option “SSD Alignment”, which is important for keeping the SSD at its best performance. Then click “Start Clone” to execute the operation.

Disk Clone Preview

In this way, a cloned hard drive will not show wrong size no matter how larger your destination disk is. Also, you still can clone HDD to smaller SSD with the same steps above. Besides the Clone feature, AOMEI Backupper has excellent backup and restore features, so users can use it to backup operating system, and restore to the new SSD when their computer has only one SSD slot.

Conclusion

That’s all for how to fix the cloned hard drive shows wrong size problem. You can go to Disk Management to add unallocated space. Or you can simply perform hard drive clone with AOMEI Backupper which allows you to manage the partition size to suit your new hard drive.