Windows 10: Server 2025 and ReFS Drives Issue

Hi Microsoft Community,I had an issue going from an in-place Server 2022 to Server 2025 OS upgrade with ReFS drives. After the upgrade, my D:\ came back with "D:\is not accessible, The volume repair was not successful". My question is, are ReFS drives compatible with Server 2025 from during an im-place OS upgrade? I have another server to do and this has me worried. I'm hoping it was a one-off situation, but this caused me to have to restore from backup and hours of downtime. Thanks,

:)

 

ReFS on server 2016 using large amounts of disk space.

Trying to find an explanation of high disk usage that possibly were created because we are using ReFS, and a way to clean them up if possible.

Have a drive on Windows Server 2016 and it is formatted with ReFS and using 64K blocks. The amount of disk for the files is about 5TB when looking at size on disk, but the properties of the drive show 7.5TB. Under settings>storage when I click on the drive
it shows 2.5TB of system files. There is nothing installed on this drive, it is just for storing files, there are about 33,000,000 small files on it.

I have done the following:

• Show hidden files
• Show protected files
• Gave myself permissions to all files
• Ensured there are no shadow copies, both from command prompt and GUI
• Ensured protection is turned off

I saw one article that says the space being used is from ReFS, but does not explain what it is, or if there is a way to clean it up. Article also suggests that using ReFS for many small files is not a good idea. We were asked by the vendor of an application
to use ReFS.

 

Hard drive/ OS issue

a guy suggested :

• shutdown
• unhooked HDD
• restarted
• yay !!
• reconnected HDD
• restarted
• yay !!

also , try method 3
How to Unlock Drive in Windows 10: 5 Ways to Remove a Lock

 

Optical Drive Issue

Hello Anak –

Appreciate your detailed return. Your added steps really helped.

Assuming I did the steps correctly, this is where I am now.

Screenshot 12 shows my CD Disc shortcut on my desktop.
Screenshot 10 shows the CD Drive shortcut listed in the “Send to” listing.
Screenshot 11 shows the “Send to” listing after the steps were taken, but the CD drive name is not listed.

So, it appears the steps did not work for me. And, I did try the steps, “If it still won’t do ……” and still no luck.

What do you think?

JerryA