Windows 10: Wiztree - free- disk space analyser - I recommend this

Occasionally I come across a program with which I very rapidly feel comfortable- a sense that it has been properly thought out, is fast, responsive, reliable and- of course- useful.

Wiztree is one such, and is much faster than Windirstat, which also has a few drawbacks..
Antibody Software - WizTree finds the files and folders using the most disk space on your hard drive





It updates fast if you delete something, whether from its GUI or file explorer.

As you can see here it uses the MFT, so like Everything etc is quick to scan- much faster than Windirstat.




The only things I'd improve relate to the colours for the cushion disk map.

I've made some changes:
I found the default rather dull and not the most helpful.
I wanted reds and oranges for file types I might be most likely to want to delete.
I've added some file types which were not allocated a colour, some of them well known like avi, pdf for example.

You may find this of interest.

:)

 

Moving Unallocated Disk Space to End of Disk

Was commenting on the pic in post #21. Not suggesting anything. It just looked like the step you were doing was incomplete.

 

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:

http://windows.microsoft.com/en-us/windows-8/free-up-disk-space

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