Windows 10: Windows Virtual Hard Disks keep on detaching randomly

So I'm trying to download a large file 94GB on a Virtual Hard Disk since my computer doesn't have enough space. But for some reason, All of my virtual disks just detach and whenever I mount them again, I have to Download my file all the way from the beginning. Does anyone have a solution to this?

:)

 

Can't remove Hyper-V Virtual Hard Drive partition

Hi Robert,

Thank you for writing to Microsoft Community Forums.

I understand that you are facing an issue when you are trying to remove the Hyper-V Virtual Hard Drive partition. This partition is just a virtual partition that is created by using the space within your physical hard disk, so that
it can be used within Hyper-V. Since you are no longer using Hyper-V and you wish to remove the Virtual Hard Drive partition, I would suggest you to follow the steps below and check if it is helpful to you.

Steps to remove the Virtual Hard Drive partition using Disk Management:

1. Press the Windows key and
   R key, this will open the Run dialogue box for you.
   
2. Type diskmgmt.msc and press
   Enter, this will open the Disk Management Window for you.
   
3. Your Virtual Hard Drive will be indicated by a ‘blue’ drive beside the
   Disk n (n is the disk number to which the VHD is associated), select the allocated
   Volume, right-click and select Delete Volume. You can check the picture below for your reference.
   
   
   
   
4. You will receive a prompt, click on
   Yes. This will delete the volume allocated to the Virtual Hard Drive and the space allocated will now be turned into an
   Unallocated space.
   
5. To detach the Virtual Hard Drive completely,
   right-click on the Disk and select Detach VHD.
   
6. You will receive a prompt, you may click on the check box to
   Delete the virtual hard disk after removing the disk. Click on
   OK.
   

This will remove the Hyper-V Virtual Hard Drive partition from your system.

If the issue still persists, I would suggest you to post your query in IT Pro

TechNet forums, where we have support professionals who are well equipped with the knowledge on the issues with Hyper-V and Virtual Hard Drive to assist you with your query.

Regards,

Aaron Summith

Microsoft Community - Moderator

 

Compacting virtual hard disks

We must have totally different working methods

Let's see what I told to be my workflow, and check how that works in reality. Example W10 x64 VM is one I have used for ESDtoISO and UUPtoISO testing, a clean installed build 15048 with no additional software installed, upgraded several times to builds 15055, 15058, 15060 and 15061, always restored back to clean 15048. This has of course caused the VHD size to grow to multiple times what really is needed.

After the above, checking file sizes. Macrium image was made when the original 64 GB dynamically expanding VHD was 34.5 GB:




Macrium image size just under 5 GB:

After restoring Macrium image to a new dynamically expanding VHD, file size is 9.3 GB. Over two thirds smaller than original one:




The same as seen by File Explorer, yellow highlight is the original VHD, start situation, and green highlight the new VHD where Macrium image from old VHD was restored. Old VHD can now be deleted, net storage save savings over 25 GB in this example case:




(Notice that VHD has already grown over 0.5 GB since the previous screenshot a few minutes earlier. This is because in previous screenshot VM was not started yet after restoring the image.)
This of course is all logical, happens every time.

 

Virtual drive on Hard Disk disappears after rebooting…….

Thanks for replying.

So if a virtual drive gets detached each boot and I want to use it as a drive for virtual machine, will I require to re-attach it after each boot before I start the system installed on that drive ??

Secondly: I don't see also the VHDx file under the folder I have placed it. Is it OK ??