How to detach a OS disk?

Question

I recently had to detach an data disk and that got me curious on how to detach an OS disk but found no documents on it. Just want to know in future case.
Thanks in advance

Answer 1

Hi jack,

an OS Disk can't be detached from a VM.

The work around for it is you could export the OS Disk:

• Stop/Deallocate the VM
• Navigate to Disks and click on the OS Disk
• Click on Disk Export and Generate URL - Depending on the size of the disk and the internet bandwidth you should extend the URL expiration time
• Use the generated URL to start the download

for more information and detailed explanation you can look into the below previous thread
https://learn.microsoft.com/en-us/answers/questions/938670/how-to-deattach-an-os-disk
https://learn.microsoft.com/en-us/answers/questions/1418887/how-to-detach-azure-vmss-os-disk
https://learn.microsoft.com/en-us/answers/questions/2264013/how-to-reattach-an-os-disk-after-detaching-from-a

Feel free to reach out if you have any further queries.

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Thank You