Windows 10: Less free disk space -all of a sudden.

I have a near new Laptop. App. four months old.I sent it to the vendor for a memory upgrade from the factory installed 16 GB to 64 GB RAM.I received it back home yesterday. It runs perfect in any way but what surprises me is the available disk space observation:Before I shipped it to the vendor available disk space was app. 379 GB available of 474 GB.When I received it back I noticed the available free disk space was reduced to 353 GB.So where did the missing 26 GB go?The vendor never entered or logged into Windows 11 the Laptop.I would love to find an app that could inform me what is on the

:)

 

Sudden increase of used space on my hard disk

Sudden increase of used space on my hard disk

 

disk space reduced after media creation tool

Hi Sarah,

One of the possible reasons why your disk space was reduced is due to an unallocated disk space on your partitions. For us to isolate your concern, we suggest that you check your device's partition. To do this, follow the steps provided below:

• Type Computer Management on Ask me anything and press
  Enter.
• Select Storage and click on Disk Management.
• Send us a screenshot.

We look forward to your response.

 

My disk space is gone

Hi John,

Thank you for posting the query on Microsoft Community.

I do appreciate your efforts and time.

Try to run theSystem Maintenance Troubleshooter.

• 
  Press Windows key + W and type
  Troubleshooting.
  
• 
  Select Troubleshooting.
  
• 
  Select view all on the top left corner.
  
• 
  Click System Maintenance,
  follow onscreen instructions.
  

I suggest you to run Check Disk which performs an analysis of the disk. Refer to the steps below:

• Press Windows key + X.
• Click on Command prompt (Admin).
• Type chkdsk /f and hit enter.

For reference:

Tips to free up drive space on your PC:

Free up drive space in Windows - Microsoft Support

Hope this helps in resolving the issue. If the issue persists, do get back to us. We will be happy to assist you.