Fixing incorrect drive size in the Windows Explorer after cloning my system disk

The partition size was correct, but Windows 11 still was showing the old size for the drive in the Windows Explorer. But it was easy to fix with the Windows DISKPART tool.

You can see on the screenshot below that the Disk Manager was showing the correct size of the new partition 878,74 GB.

But in Windows Explorer it was only showing the old size. I used Clonezilla in an expert mode that should make it all good. Indeed, the partition size was extended by the filesystem visible for Windows was not and still showing the drive size the same as on the old drive.

How to fix the wrong disk size in Windows Explorer after disk cloning?

Disclaimer: By making any changes in the DISKPART tool you may lose all your data.

In Windows run the command line as administrator and type: diskpart. It will run the disk part tool.

First, let's check the available disks with command: list disk

Find the disk that is causing problems, here we have just one so it's easy. And then we need to select the disk that will be used for all operation with select disk=0

Now we can see what partitions are available on the disk by running: list partition

Here we have a bigger list of partitions. My partition was simply the biggest one called 'Primary' and with number 3. The other partitions are system partitions and there is no need to touch them.

Let's select the partition to make changes: select partition=3

and finally, we can fix the file system with command: extend filesystem

Now we can see that Windows Explorer shows the right size 878 GB.