- Launch VirtualBox
Select Virtual Media Manager from the File menu
When Virtual Media Manager window opens, select the VM file you want to migrate and click on Copy button
When the Copy Virtual Hard Disk window opens, click on ExpertMode button to enable selecting required options on one screen.
Under Hard disk file type, select VHD (Virtual Hard Disk)
Wait for the copy process to complete
Convert vhd to vhdx
- Launch Hyper-V Manager
- Under Actions, select Edit Disk…
- Click Next on the ‘Before You Begin’ screen
- Browse for the copied file. The file will be having a file extension of vhd. Select the file and click Next button.
On the Choose Action window, select Convert and click Next button
Select VHDX format and click Next
Select Dynamically expanding and click Next
Select a name and location for the file and click Next
Click Finish and wait for the conversion process to complete