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not able to expend my volume in my VM

I am running a windows VM.  I have just extended the storage in my host server to the VM.
As you can see, I have over 1TB available, or that I should be able to expand my current drive, to use the unallocated space.
The problem is, why is the "extend volume" option greyed out?   I need to select Extend volume, so I can extend my volume.

Running windows server 2016

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Seth Simmons
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So I'm getting this error message

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Thanks lee for the details, it’s not converting the disk, but wiping it and starting fresh.  This is a joke from MS.
A true conversion should not require that you lose all data, as with OS data, you can’t just copy and paste.

This is for my WSUS server, but over the last year, this servers storage grew from 100gb to 2TB, all because of MS’s catalog files.

I will just have to create a new WSUS server and delete this one when the new one is in production.
The tool mbr2gpt.exe allows the conversion without losing data. You would need to mount the virtual hard drive on a system that supports mbr2gpt, namely win10 v1703 or higher.
Go to your virtual memory settings and turn off the pagefile.  The pagefile is a fixed file on disk and those blocks are marked as unmovable.  This is Windows equivalent to a fixed swapped partition, but created on the fly.  Once that pagefile is gone.  You should be able to convert the disk.

Also, for a VM, why do you even have a pagefile?  Unless you have limited RAM on your system, you should just size the RAM appropriately and turn off the pagefile.

To turn off the pagefile:
Go to the start menu and search for Advanced system Settings.
Select View Advanced System Settings.
The "System Properties" dialog box should open to the Advanced tab.
Click on the Settings button in the Performance box.
The Performance Options dialog box will open.
Select the Advanced tab
Click Change in the Virtual Memory box.
Click on the No paging file radio button.
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mcknife, thanks for the info, but I don't think it works with windows server, as I don't see that file anywhere in my windows /system32

serialband, so how does turning off the pagefile fix my issue with my partition not recognizing the other 1TB?
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I think at this point, I might just have to build a new server and delete this one?
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"mcknife, thanks for the info, but I don't think it works with windows server, as I don't see that file anywhere in my windows /system32" - you misunderstood. I didn't tell you to use the server OS, but instead windows 10 1703 or higher in order to mount the virtual hard drive of the server.
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Mcknife, I see, so take the application from my windows 10 to the server, and run it on the server, got it.
No. You boot a windows 10 and mount that virtual hard drive.
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Got it, I wonder how long it takes to convert, as that means the server will be down during that timeframe.
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Thanks guys for your help