I need to increase size of OS disk of classic windows VM? so my question about Classic Not ARM
Please try the following cmdlet and see if it helps
Update-AzureDisk -DiskName [Disk-Name] -Label [DiskLabel]-ResizedSizeInGB 1020
If the step is success, you can see the unused space (expanded size) from disk manager of the VM
Please mark as "Accept the answer" if the above steps helps you. Others with similar issues can also follow the solution as per your suggestion
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